EXECUTION COPY

                                          
                                          
                                          
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                                     INDENTURE
                                          
                                          
                           -----------------------------
                                          
                              Dated as of May 27, 1998

                           -----------------------------
                                          
                                          
                                          
                                      between
                                          
                                 GETTY IMAGES, INC.
                                          
                                     as Issuer,
                                          
                                        and
                                          
                                THE BANK OF NEW YORK
                                          
                                     as Trustee
                                          
                                          
                                          
                                          
                                          
                                    $75,000,000
                                          
           (With an Over-Allotment Option for an Additional $11,250,000)
                                          
                   4.75% Convertible Subordinated Notes due 2003
                                          
                                          
                                          
                                          
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<PAGE>
                                          
                                          
                                          

                                CROSS-REFERENCE TABLE


            TIA SECTION . . . . . . . . . . . . . . INDENTURE SECTION

             310(a)(1)  . . . . . . . . . . . . . . . . . 7.10
               (a)(2) . . . . . . . . . . . . . . . . . . 7.10
               (a)(3) . . . . . . . . . . . . . . . . . . N.A.
               (a)(4) . . . . . . . . . . . . . . . . . . N.A.
               (a)(5) . . . . . . . . . . . . . . . . . . 7.10
                (b) . . . . . . . . . . . . . . . . 7.8; 7.10; 13.2
                (b) . . . . . . . . . . . . . . . . . . . N.A.
               311(a) . . . . . . . . . . . . . . . . . . 7.11
                (b) . . . . . . . . . . . . . . . . . . . 7.11
                (c) . . . . . . . . . . . . . . . . . . . N.A.
               312(a) . . . . . . . . . . . . . . . . . . 2.5
                (b) . . . . . . . . . . . . . . . . . . . 13.3
                (c) . . . . . . . . . . . . . . . . . . . 13.3
               313(a) . . . . . . . . . . . . . . . . . . 7.6
               (b)(1) . . . . . . . . . . . . . . . . . . N.A.
               (b)(2) . . . . . . . . . . . . . . . . . . 7.6
                (c) . . . . . . . . . . . . . . . . . . 7.6; 13.2
                (d) . . . . . . . . . . . . . . . . . . . 7.6
               314(a) . . . . . . . . . . . . . . . . 4.6; 4.7; 13.2
                (b) . . . . . . . . . . . . . . . . . . . N.A.
               (c)(1) . . . . . . . . . . . . . . 2.2; 7.2; 8.1; 13.4
               (c)(2) . . . . . . . . . . . . . . . . . 7.2; 13.4
               (c)(3) . . . . . . . . . . . . . . . . . . N.A.
                (d) . . . . . . . . . . . . . . . . . . . N.A.
                (e) . . . . . . . . . . . . . . . . . . . 13.5
                (f) . . . . . . . . . . . . . . . . . . . N.A.
               315(a) . . . . . . . . . . . . . . . . . . 7.1(b)
                (b) . . . . . . . . . . . . . . . . . . 7.5; 13.2
                (c) . . . . . . . . . . . . . . . . . .  7.1(a)
                (d) . . . . . . . . . . . . . . . 2.8; 6.11; 7.1(b)(c)
                (e) . . . . . . . . . . . . . . . . . . . 6.13
       316(a) (last sentence) . . . . . . . . . . . . . . 2.9
             (a)(1)(A)  . . . . . . . . . . . . . . . . . 6.11
             (a)(1)(B)  . . . . . . . . . . . . . . . . . 6.12
               (a)(2) . . . . . . . . . . . . . . . . . .  N.A.
                (b) . . . . . . . . . . . . . . . .  6.7; 6.8; 6.12
               316(c) . . . . . . . . . . . . . . . . . .  N.A.
             317(a)(1)  . . . . . . . . . . . . . . . . .  6.3
               (a)(2) . . . . . . . . . . . . . . . . . .  6.4
                (b) . . . . . . . . . . . . . . . . . . .  2.4
               318(a) . . . . . . . . . . . . . . . . . .  13.1

N.A. means Not Applicable.

Note:  This Cross-Reference Table shall not, for any purpose, be deemed to be a
part of the Indenture.

<PAGE>


                                  TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                              PAGE
                                                                              ----
<S>                                                                             <C>

ARTICLE I.     DEFINITIONS AND INCORPORATION BY REFERENCE . . . . . . . . . . .  1
  SECTION 1.1.   Definitions. . . . . . . . . . . . . . . . . . . . . . . . . .  1
  SECTION 1.2.   Incorporation by Reference of TIA. . . . . . . . . . . . . . . 10
  SECTION 1.3.   Rules of Construction. . . . . . . . . . . . . . . . . . . . . 10

ARTICLE II.    THE SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . 11
  SECTION 2.1.   Form and Dating. . . . . . . . . . . . . . . . . . . . . . . . 11
  SECTION 2.2.   Execution and Authentication . . . . . . . . . . . . . . . . . 12
  SECTION 2.3.   Registrar and Paying Agent . . . . . . . . . . . . . . . . . . 13
  SECTION 2.4.   Paying Agent to Hold Assets in Trust . . . . . . . . . . . . . 13
  SECTION 2.5.   Securityholder Lists . . . . . . . . . . . . . . . . . . . . . 14
  SECTION 2.6.   Transfer and Exchange. . . . . . . . . . . . . . . . . . . . . 14
  SECTION 2.7.   Replacement Securities . . . . . . . . . . . . . . . . . . . . 22
  SECTION 2.8.   Outstanding Securities . . . . . . . . . . . . . . . . . . . . 22
  SECTION 2.9.   Treasury Securities. . . . . . . . . . . . . . . . . . . . . . 23
  SECTION 2.10.  Temporary Securities . . . . . . . . . . . . . . . . . . . . . 23
  SECTION 2.11.  Cancellation . . . . . . . . . . . . . . . . . . . . . . . . . 24
  SECTION 2.12.  Interest and Defaulted Interest. . . . . . . . . . . . . . . . 24
  SECTION 2.13   CUSIP Numbers. . . . . . . . . . . . . . . . . . . . . . . . . 25
                                                                               
ARTICLE III.   REDEMPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
  SECTION 3.1.   Right of Redemption. . . . . . . . . . . . . . . . . . . . . . 26
  SECTION 3.2.   Notices to Trustee . . . . . . . . . . . . . . . . . . . . . . 26
  SECTION 3.3.   Selection of Securities to Be Redeemed . . . . . . . . . . . . 26
  SECTION 3.4.   Notice of Redemption . . . . . . . . . . . . . . . . . . . . . 27
  SECTION 3.5.   Effect of Notice of Redemption . . . . . . . . . . . . . . . . 28
  SECTION 3.6.   Deposit of Redemption Price. . . . . . . . . . . . . . . . . . 28
  SECTION 3.7.   Securities Redeemed in Part. . . . . . . . . . . . . . . . . . 29
  SECTION 3.8.   Conversion Arrangement on Call for Redemption. . . . . . . . . 29
  
ARTICLE IV.    COVENANTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
  SECTION 4.1.   Payment of Securities. . . . . . . . . . . . . . . . . . . . . 30
  SECTION 4.2.   Maintenance of Office or Agency. . . . . . . . . . . . . . . . 30
  SECTION 4.3.   Corporate Existence. . . . . . . . . . . . . . . . . . . . . . 31
  SECTION 4.4.   Payment of Taxes and Other Claims. . . . . . . . . . . . . . . 31
  SECTION 4.5.   Maintenance of Properties and Insurance. . . . . . . . . . . . 31
  SECTION 4.6.   Compliance Certificate; Notice of Default. . . . . . . . . . . 32
  SECTION 4.7.   Reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
  SECTION 4.8.   Limitation on Status as Investment Company . . . . . . . . . . 33
  SECTION 4.9.   Waiver of Stay, Extension and Usury Laws . . . . . . . . . . . 33
  SECTION 4.10.  Rule 144A Information Requirement. . . . . . . . . . . . . . . 34
  SECTION 4.11.  Qualification of Indenture . . . . . . . . . . . . . . . . . . 34
  SECTION 4.12.  Registration Rights. . . . . . . . . . . . . . . . . . . . . . 34
                                                                               
ARTICLE V.     SUCCESSOR CORPORATION. . . . . . . . . . . . . . . . . . . . . . 34                                         
  SECTION 5.1.   Limitation on Merger, Sale or Consolidation. . . . . . . . . . 34
  SECTION 5.2.   Successor Corporation Substituted. . . . . . . . . . . . . . . 35
                                                                               
ARTICLE VI.    EVENTS OF DEFAULT AND REMEDIES . . . . . . . . . . . . . . . . . 35
</TABLE>

                                     (i)

<PAGE>

<TABLE>

<S>                                                                             <C>
  SECTION 6.1.   Events of Default. . . . . . . . . . . . . . . . . . . . . . . 35
  SECTION 6.2.   Acceleration of Maturity Date; Rescission and Annulment. . . . 38
  SECTION 6.3.   Collection of Indebtedness and Suits for Enforcement by 
                   Trustee. . . . . . . . . . . . . . . . . . . . . . . . . . . 39
  SECTION 6.4.   Trustee May File Proofs of Claim . . . . . . . . . . . . . . . 39
  SECTION 6.5.   Trustee May Enforce Claims Without Possession of Securities. . 40
  SECTION 6.6.   Priorities . . . . . . . . . . . . . . . . . . . . . . . . . . 41
  SECTION 6.7.   Limitation on Suits. . . . . . . . . . . . . . . . . . . . . . 41
  SECTION 6.8.   Unconditional Right of Holders to Receive Payments and to       
                 Convert. . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
  SECTION 6.9.   Rights and Remedies Cumulative . . . . . . . . . . . . . . . . 42
  SECTION 6.10.  Delay or Omission Not Waiver.  . . . . . . . . . . . . . . . . 42
  SECTION 6.11.  Control by Holders.  . . . . . . . . . . . . . . . . . . . . . 43
  SECTION 6.12.  Waiver of Past Default.  . . . . . . . . . . . . . . . . . . . 43
  SECTION 6.13.  Undertaking for Costs. . . . . . . . . . . . . . . . . . . . . 43
  SECTION 6.14.  Restoration of Rights and Remedies.  . . . . . . . . . . . . . 44

ARTICLE VII.   TRUSTEE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
  SECTION 7.1.   Duties of Trustee  . . . . . . . . . . . . . . . . . . . . . . 44
  SECTION 7.2.   Rights of Trustee  . . . . . . . . . . . . . . . . . . . . . . 45
  SECTION 7.3.   Individual Rights of Trustee . . . . . . . . . . . . . . . . . 47
  SECTION 7.4.   Trustee's Disclaimer . . . . . . . . . . . . . . . . . . . . . 47
  SECTION 7.5.   Notice of Default. . . . . . . . . . . . . . . . . . . . . . . 47
  SECTION 7.6.   Reports by Trustee to Holders. . . . . . . . . . . . . . . . . 47
  SECTION 7.7.   Compensation and Indemnity . . . . . . . . . . . . . . . . . . 47
  SECTION 7.8.   Replacement of Trustee . . . . . . . . . . . . . . . . . . . . 48
  SECTION 7.9.   Successor Trustee by Merger, Etc . . . . . . . . . . . . . . . 50
  SECTION 7.10.  Eligibility; Disqualification. . . . . . . . . . . . . . . . . 50
  SECTION 7.11.  Preferential Collection of Claims Against Company. . . . . . . 50
                                                                               
ARTICLE VIII.  SATISFACTION AND DISCHARGE . . . . . . . . . . . . . . . . . . . 50
  SECTION 8.1.   Satisfaction and Discharge of Indenture. . . . . . . . . . . . 50
  SECTION 8.2.   Repayment to the Company . . . . . . . . . . . . . . . . . . . 51
                                                                               
ARTICLE IX.    AMENDMENTS, SUPPLEMENTS AND WAIVERS. . . . . . . . . . . . . . . 51
  SECTION 9.1.   Supplemental Indentures Without Consent of Holders . . . . . . 51
  SECTION 9.2.   Amendments, Supplemental Indentures and Waivers with Consent     
                   of Holders . . . . . . . . . . . . . . . . . . . . . . . . . 51
  SECTION 9.3.   Compliance with TIA. . . . . . . . . . . . . . . . . . . . . . 53
  SECTION 9.4.   Revocation and Effect of Consents. . . . . . . . . . . . . . . 53
  SECTION 9.5.   Notation on or Exchange of Securities. . . . . . . . . . . . . 54
  SECTION 9.6.   Trustee to Sign Amendments, Etc. . . . . . . . . . . . . . . . 54
                                                                               
ARTICLE X.     RIGHT TO REQUIRE REPURCHASE UPON A CHANGE OF CONTROL. . . . . .  54
  SECTION 10.1.  Repurchase of Securities at Option of the Holder Upon a 
                   Change of Control. . . . . . . . . . . . . . . . . . . . . . 54
  SECTION 10.2.  Election to Pay Repurchase Price in Common Stock . . . . . . . 57
                                                                               
ARTICLE XI.    SUBORDINATION. . . . . . . . . . . . . . . . . . . . . . . . . . 58
  SECTION 11.1.  Securities Subordinated to Senior Indebtedness.  . . . . . . . 58

</TABLE>

                                   (ii)

<PAGE>


<TABLE>

<S>                                                                             <C>
  SECTION 11.2.  No Payment on Securities in Certain Circumstances. . . . . . . 59
  SECTION 11.3.  Securities Subordinated to Prior Payment of All Senior         
                   Indebtedness on Dissolution, Liquidation or Reorganization . 60
  SECTION 11.4.  Securityholders to Be Subrogated to Rights of Holders of 
                   Senior Indebtedness. . . . . . . . . . . . . . . . . . . . . 62
  SECTION 11.5.  Obligations of the Company Unconditional.  . . . . . . . . . . 62
  SECTION 11.6.  Trustee Entitled to Assume Payments Not Prohibited in Absence  
                   of Notice. . . . . . . . . . . . . . . . . . . . . . . . . . 63
  SECTION 11.7.  Application by Trustee of Assets Deposited with It.  . . . . . 63
  SECTION 11.8.  Subordination Rights Not Impaired by Acts or Omissions of      
                   the Company or Holders of Senior Indebtedness. . . . . . . . 64
  SECTION 11.9.  Securityholders Authorize Trustee to Effectuate Subordination  
                   of Securities. . . . . . . . . . . . . . . . . . . . . . . . 64
  SECTION 11.10. Right of Trustee to Hold Senior Indebtedness . . . . . . . . . 64
  SECTION 11.11. Article XI Not to Prevent Events of Default. . . . . . . . . . 65
  SECTION 11.12. No Fiduciary Duty of Trustee to Holders of Senior
                   Indebtedness . . . . . . . . . . . . . . . . . . . . . . . . 65

ARTICLE XII.   CONVERSION OF SECURITIES . . . . . . . . . . . . . . . . . . . . 65
  SECTION 12.1.  Conversion Privilege . . . . . . . . . . . . . . . . . . . . . 65
  SECTION 12.2.  Exercise of Conversion Privilege . . . . . . . . . . . . . . . 66
  SECTION 12.3.  Fractional Interests . . . . . . . . . . . . . . . . . . . . . 67
  SECTION 12.4.  Conversion Price . . . . . . . . . . . . . . . . . . . . . . . 68
  SECTION 12.5.  Adjustment of Conversion Price . . . . . . . . . . . . . . . . 68
  SECTION 12.6.  Continuation of Conversion Privilege in Case of                
                   Reclassification, Merger, Consolidation or Sale of Assets. . 74
  SECTION 12.7.  Notice of Certain Events . . . . . . . . . . . . . . . . . . . 75
  SECTION 12.8.  Taxes on Conversion. . . . . . . . . . . . . . . . . . . . . . 76
  SECTION 12.9.  Company to Provide Stock . . . . . . . . . . . . . . . . . . . 77
  SECTION 12.10. Disclaimer of Responsibility for Certain Matters . . . . . . . 77
  SECTION 12.11. Return of Funds Deposited for Redemption of Converted         
                   Securities . . . . . . . . . . . . . . . . . . . . . . . . . 78
                                                                               
ARTICLE XIII.  MISCELLANEOUS. . . . . . . . . . . . . . . . . . . . . . . . . . 78
  SECTION 13.1.  TIA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
  SECTION 13.2.  Notices. . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
  SECTION 13.3.  Communications by Holders with Other Holders . . . . . . . . . 79
  SECTION 13.4.  Certificate and Opinion as to Conditions Precedent . . . . . . 79
  SECTION 13.5.  Statements Required in Certificate or Opinion. . . . . . . . . 79
  SECTION 13.6.  Rules by Trustee, Paying Agent, Registrar. . . . . . . . . . . 80
  SECTION 13.7.  Payment Dates. . . . . . . . . . . . . . . . . . . . . . . . . 80
  SECTION 13.8.  Governing Law. . . . . . . . . . . . . . . . . . . . . . . . . 80
</TABLE>

                                          (iii)

<PAGE>

<TABLE>

<S>                                                                            <C>
  SECTION 13.9.  No Adverse Interpretation of Other Agreements . . . . . . . . 80
  SECTION 13.10. No Recourse Against Others. . . . . . . . . . . . . . . . . . 80
  SECTION 13.11. Successors. . . . . . . . . . . . . . . . . . . . . . . . . . 81
  SECTION 13.12. Duplicate Originals.  . . . . . . . . . . . . . . . . . . . . 81
  SECTION 13.13. Severability. . . . . . . . . . . . . . . . . . . . . . . . . 81
  SECTION 13.14. Table of Contents, Headings, Etc. . . . . . . . . . . . . . . 81
                                                                               
EXHIBITS
--------

EXHIBIT A      Form of Security. . . . . . . . . . . . . . . . . . . . . . . . A-1

EXHIBIT B      Investor Letter of Representation . . . . . . . . . . . . . . . B-1

EXHIBIT C      Form of Conversion Notice . . . . . . . . . . . . . . . . . . . C-1

</TABLE>








                                     (iv)


<PAGE>

     INDENTURE, dated as of May 27, 1998, between GETTY IMAGES, INC.   a 
Delaware corporation (the "Company"), and THE BANK OF NEW YORK, a New York 
banking corporation, as Trustee."

     Each party hereto agrees as follows for the benefit of each other party 
and for the equal and ratable benefit of the Holders of the Company's 4.75% 
Convertible Subordinated Notes due 2003.     

                                  ARTICLE I.

                  DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.1.   DEFINITIONS.

          "Acceleration Notice" shall have the meaning specified in Section 6.2.

          "Affiliate" means any Person directly or indirectly controlling or 
controlled by or under direct or indirect common control with the Company.  
For purposes of this definition, the term "control" means the power to direct 
the management and policies of a Person, directly or through one or more 
intermediaries, whether through the ownership of voting securities, by 
contract, or otherwise.

          "Agent" means any Registrar, Paying Agent or co-Registrar or any 
successor thereto.

          "Bankruptcy Law" means Title 11, U.S. Code, or any similar Federal, 
state or foreign law for the relief of debtors.

          "beneficial owner" for purposes of the definition of Change of 
Control has the meaning attributed to it in Rules 13d-3 and 13d-5 under the 
Exchange Act (as in effect on the Issue Date), whether or not applicable, 
except that a "Person" shall be deemed to have "beneficial ownership" of all 
shares that any such Person has the right to acquire, whether such right is 
exercisable immediately or only after the passage of time or upon the 
occurrence of certain events.

          "Board of Directors" means, with respect to any Person, the Board 
of Directors of such Person or any committee of the Board of Directors of 
such Person authorized, with respect to any particular matter, to exercise 
the power of the Board of Directors of such Person.

          "Board Resolution" means, with respect to any Person, a duly 
adopted resolution of the Board of Directors of such Person.

          "Business Day" means each Monday, Tuesday, Wednesday, Thursday and 
Friday that is not a day on which banking institutions in The City of New 
York, New York, are authorized or obligated by law or executive order to 
close.

<PAGE>

          "Capital Stock" means, with respect to any corporation, any and all 
shares, interests, rights to purchase (other than convertible or exchangeable 
Indebtedness), warrants, options, participations or other equivalents of or 
interests (however designated) in stock issued by that corporation.

          "Capitalized Lease Obligation" means, as to any Person, the 
obligation of such Person to pay rent or other amounts under a lease to which 
such Person is a party that is required to be classified and accounted for as 
a capital lease obligation under GAAP.

          "Cash" means such coin or currency of the United States of America 
as at the time of payment shall be legal tender for the payment of public and 
private debts.

          "Change of Control" means:

          (i)  an event or series of events as a result of which any "person" or
     "group" (as such terms are used in Sections 13(d)(3) and 14(d) of the
     Exchange Act) (excluding the Company or any wholly-owned subsidiary
     thereof) is or becomes, directly or indirectly, the "beneficial owner" (as
     defined in Rules 13d-3 and 13d-5 under the Exchange Act, whether or not
     applicable) of more than 50% of the combined voting power of the then
     outstanding securities entitled to vote generally in elections of
     directors, managers or trustees, as applicable, of the Company or any
     successor entity ("Voting Stock"); or

          (ii)  the completion of any consolidation with or merger of the
     Company into any other Person, or conveyance, transfer or lease by the
     Company of all or substantially all of its assets to any Person, or any
     merger of any other Person into the Company in a single transaction or
     series of related transactions, and, in the case of any such transaction or
     series of related transactions, the outstanding Common Stock of the Company
     is changed or exchanged as a result, unless the stockholders of the Company
     immediately before such transaction own, directly or indirectly,
     immediately following such transaction, at least a majority of the combined
     voting power of the outstanding Voting Stock of the Person resulting from
     such transaction in substantially the same proportion as their ownership of
     the Voting Stock immediately before such transaction;

provided that a Change of Control shall not be deemed to have occurred if the 
Last Sale Price of the Common Stock for any five Trading Days during the 10 
Trading Days immediately preceding the Change of Control is at least equal to 
105% of the Conversion Price in effect on each such trading day.


                                      -2-

<PAGE>

          "Code" means the Internal Revenue Code of 1986, as amended.

          "Common Stock" means the Company's common stock, par value $.01 per 
share, or as such stock may be reconstituted from time to time.

          "Company" means the party named as such in this Indenture until a 
successor replaces it pursuant to the Indenture, and thereafter means such 
successor.

          "Conversion Price" shall have the meaning specified in Section 12.4.

          "Conversion Shares" shall have the meaning specified in Section 
12.5(1).

          "Custodian" means any receiver, trustee, assignee, liquidator, 
sequestrator or similar official under any Bankruptcy Law.

          "Date of Conversion" shall have the meaning specified in Section 
12.2.

          "Default" means any event or condition that, after notice or 
passage of time or both would be, an Event of Default.

          "Defaulted Interest" shall have the meaning specified in Section 
2.12.

          "Definitive Securities" means Securities that are in the form of 
Security attached hereto as Exhibit A that do not include the information 
called for by footnotes 1 and 2 thereof.

          "Depositary" means, with respect to the Securities issuable or 
issued in whole or in part in global form, the Person specified in Section 
2.3 as the Depositary with respect to the Securities, until a successor shall 
have been appointed and become such pursuant to the applicable provision of 
this Indenture, and, thereafter, "Depositary" shall mean or include such 
successor.

          "Designated Senior Indebtedness" means the Company's obligations 
under its revolving credit facility, dated 9th February 1998, with Midland 
Bank plc, and the Company's obligations under any other Senior Indebtedness 
in which the instrument creating or evidencing the same or any assumption or 
guarantee thereof (or related agreements or documents to which the Company is 
a party) expressly provides that such Senior Indebtedness shall be 
"Designated Senior Indebtedness" for the purposes of this Indenture; provided 
that any such instrument, agreement or other document may place limitations 
and conditions on the rights of the holders of such Senior Indebtedness to 
exercise the rights of the holders of Designated Senior Indebtedness.


                                      -3-

<PAGE>

          "Disqualified Capital Stock" means, with respect to the Company, 
Capital Stock of the Company that, by its terms or by the terms of any 
security into which it is convertible, exercisable or exchangeable, is, or 
upon the happening of an event or the passage of time would be, required to 
be redeemed or repurchased (including at the option of the holder thereof) by 
the Company, in whole or in part, on or prior to the Stated Maturity of the 
Notes, provided that only the portion of such Capital Stock which is so 
convertible, exercisable, exchangeable or redeemable or subject to repurchase 
prior to such Stated Maturity shall be deemed to be Disqualified Capital 
Stock.

          "Distribution Date" shall have the meaning specified in Section 12.5.

          "DTC" shall have the meaning specified in Section 2.3.

          "Event of Default" shall have the meaning specified in Section 6.1.

          "Exchange Act" means the Securities Exchange Act of 1934, as 
amended, and the rules and regulations promulgated by the SEC thereunder.

          "Expiration Date" shall have the meaning specified in Section 12.5.

          "GAAP" means United States generally accepted accounting principles 
set forth in the opinions and pronouncements of the Accounting Principles 
Board of the American Institute of Certified Public Accountants and 
statements and pronouncements of the Financial Accounting Standards Board 
("FASB") or in such other statements by such other entity as approved by a 
significant segment of the accounting profession which are in effect in the 
United States.

          "Global Security" means a Security that contains the paragraph 
referred to in footnote 1 and the additional schedule referred to in footnote 
2 to the form of Security attached hereto as Exhibit A.  There shall be one 
or more Global Securities to evidence interests in the Securities held (x) by 
"qualified institutional buyers", as defined in Rule 144A under the 
Securities Act, and (y) by institutional "accredited investors" as defined in 
Rule 501(a)(1), (2), (3) or (7) under Regulation D of the Securities Act.

          "Holder" or "Securityholder" means the Person in whose name a 
Security is registered on the Registrar's books.

          "Indebtedness" of any Person means, without duplication, (a) all 
liabilities and obligations, contingent or otherwise, of any such Person, (i) 
in respect of borrowed money (whether or not the lender has recourse to all 
or any portion of the assets of such Person), (ii) evidenced by credit or 
loan agreements, bonds, notes, debentures or similar 


                                      -4-

<PAGE>

instruments (including, without limitation, notes or similar instruments 
given in connection with the acquisition of any business, properties or 
assets of any kind), (iii) evidenced by bankers' acceptances or similar 
instruments issued or accepted by banks, (iv) for the payment of money 
relating to a Capitalized Lease Obligation, or (v) evidenced by a letter of 
credit or reimbursement obligation of such Person with respect to any letter 
of credit; (b) all obligations of such Person issued or assumed as the 
deferred purchase price of property or services (but excluding trade accounts 
payable or accrued liabilities arising in the ordinary course of business); 
(c) all net obligations of such Person under Interest Swap and Hedging 
Obligations; (d) all liabilities of others of the kind described in the 
preceding clause (a), (b) or (c) that such Person has guaranteed or that is 
otherwise its legal liability, or which is secured by a lien on property of 
such Person; and (e) any and all deferrals, renewals, extensions, 
modifications, replacements, restatements, refinancings and refundings 
(whether direct or indirect) of, or any indebtedness or obligation issued in 
exchange for, any liability of the kind described in any of the preceding 
clauses (a), (b), (c) or (d), or this clause (e), whether or not between or 
among the same parties.

          "Indenture" means this Indenture, as amended or supplemented from 
time to time in accordance with the terms hereof.

          "interest" means and includes stated interest on the Securities 
and, to the extent applicable, Liquidated Damages.

          "Institutional Accredited Investor" means any Person that is an 
institutional "accredited investor" as defined in Rule 501(a)(1), (2), (3) or 
(7) of Regulation D under the Securities Act.

          "Initial Purchasers" means the Persons designated as such in the 
Purchase Agreement.

          "Interest Payment Date" means the stated due date of an installment 
of interest on the Securities.

          "Interest Swap and Hedging Obligations" means the obligations of 
any Person under any interest rate protection agreement, interest rate future 
agreement, interest rate option agreement, interest rate swap agreement, 
interest rate cap agreement or other interest rate hedge agreement, interest 
rate collar agreement or other similar agreement or arrangement to which such 
Person is a party or beneficiary.

          "Issue Date" means the date of first issuance of the Securities 
under this Indenture.

          "Junior Securities" means any Qualified Capital Stock and any 
Indebtedness of the Company that is at least as subordinated in right of 
payment to Senior Indebtedness as the Securities and has no scheduled 
installment of principal due, 


                                      -5-

<PAGE>

by redemption, sinking fund payment or otherwise, on or prior to the Stated 
Maturity of the Securities.

          "Last Sale Price" shall have the meaning specified in Section 12.3.

          "Lien" means any mortgage, lien, pledge, charge, security interest 
or other encumbrance of any kind, whether or not filed, recorded or otherwise 
perfected under applicable law (including any conditional sale or other title 
retention agreement and any lease deemed to constitute a security interest 
and any option or other agreement to give any security interest).

          "Liquidated Damages" shall have the meaning specified in the 
Registration Rights Agreement.

          "non-electing share" shall have the meaning specified in Section 
12.6.

          "Non-Payment Default" shall have the meaning specified in Section 
11.2.

          "Notice of Default" shall have the meaning specified in Section 
6.1(3).

          "Offer" shall have the meaning specified in Section 12.5.

          "Officer" means, with respect to the Company, the Chairman or any 
Co-Chairman, the Chief Executive Officer, the President, any Vice President, 
the Chief Financial Officer, the Treasurer, the Controller or the Secretary 
of the Company.

          "Officers' Certificate" means, with respect to the Company, a 
certificate signed by two Officers or by an Officer and an Assistant 
Secretary of the Company and otherwise complying with the requirements of 
Section 2.2, if applicable, and the applicable provisions of Sections 13.4 
and 13.5.

          "Opinion of Counsel" means a written opinion from legal counsel who 
is reasonably acceptable to the Trustee and which complies with the 
applicable requirements of Sections 13.4 and 13.5.

          "Paying Agent" shall have the meaning specified in Section 2.3.

          "Payment Blockage Notice" shall have the meaning specified in 
Section 11.2.

          "Payment Blockage Period" shall have the meaning specified in 
Section 11.2.

          "Payment Default" shall have the meaning specified in Section 11.2.


                                      -6-

<PAGE>

          "Person" means any corporation, individual, limited liability 
company, joint stock company, joint venture, partnership, unincorporated 
association, governmental regulatory entity, country, state or political 
subdivision thereof, trust, municipality or other entity.

          "PORTAL Market" means the Private Offerings, Resales and Trading 
through Automated Linkages Market operated by the National Association of 
Securities Dealers, Inc. or any successor thereto.

          "property" means any right or interest in or to property or assets 
of any kind whatsoever, whether real, personal or mixed and whether tangible 
or intangible.

          "Purchase Agreement" means that certain Purchase Agreement, dated 
May 20, 1998, by and among the Company and the Initial Purchasers, as such 
agreement may be amended, modified or supplemented from time to time in 
accordance with the terms thereof.

          "Purchased Shares" shall have the meaning specified in Section 12.5.

          "Qualified Capital Stock" means any Capital Stock of the Company 
that is not Disqualified Capital Stock.

          "QIB" means a Person that is a "qualified institutional buyer" as 
defined in Rule 144A under the Securities Act.

          "Record Date" means a Record Date specified in the Securities 
whether or not such Record Date is a Business Day.

          "Redemption Date," when used with respect to any Security to be 
redeemed, means the date fixed for such redemption pursuant to Article III of 
this Indenture and the form of Security.

          "Redemption Price," when used with respect to any Security to be 
redeemed, means the redemption price for such redemption pursuant to 
Paragraph 5 in the form of Security, which shall include, without 
duplication, in each case, accrued and unpaid interest, if any, to and 
including the Redemption Date.

          "Registrar" shall have the meaning specified in Section 2.3.

          "Registration Rights Agreement" means the Registration Rights 
Agreement, dated the date hereof, by and among the Initial Purchasers and the 
Company, as such agreement may be amended, modified or supplemented from time 
to time in accordance with the terms thereof.

          "Repurchase Date" shall have the meaning specified in Section 10.1.


                                      -7-

<PAGE>

          "Repurchase Offer" shall have the meaning specified in Section 10.1.

          "Repurchase Offer Period" shall have the meaning specified in 
Section 10.1.

          "Repurchase Price" shall have the meaning specified in Section 10.1.

          "Repurchase Put Date" shall have the meaning specified in Section 
10.1.

          "Restricted Security" means a Security, unless or until it has been 
(i) disposed of in a transaction effectively registered under the Securities 
Act or (ii) distributed to the public pursuant to Rule 144 (or any similar 
provision then in force) under the Securities Act.

          "SEC" means the Securities and Exchange Commission and any other 
Person hereafter succeeding to the duties thereof under the Securities Act, 
the TIA or the Exchange Act.

          "Securities" means, collectively, the 4.75% Convertible 
Subordinated Notes due 2003, as supplemented from time to time in accordance 
with the terms hereof, issued under this Indenture.

          "Securities Act" means the Securities Act of 1933, as amended, and 
the rules and regulations of the SEC promulgated thereunder.

          "Securities Custodian" means the Trustee, as custodian with respect 
to the Securities in global form, or any successor entity thereto.

          "Senior Indebtedness" means all obligations of the Company to pay 
the principal of, premium, if any, interest (including all interest accruing 
subsequent to the commencement of any bankruptcy or similar proceeding, 
whether or not a claim for post-petition interest is allowable as a claim in 
any such proceeding) on, and all fees, costs, expenses and other amounts 
accrued or due on or in connection with, any Indebtedness of the Company, 
whether outstanding on the date of this Indenture or thereafter created, 
incurred, assumed, guaranteed or in effect guaranteed by the Company, unless 
the instrument creating or evidencing such Indebtedness provides that such 
Indebtedness is not senior or superior in right of payment to the Securities 
or is pari passu with, or subordinated to, the Securities; provided that in 
no event shall Senior Indebtedness include (a) Indebtedness of the Company 
owed or owing to any Subsidiary of the Company or any officer, director or 
employee of the Company or any Subsidiary of the Company, (b) Indebtedness 
representing or with respect to any account payable or other accrued current 
liability or obligation incurred in the ordinary course of business in 
connection with the obtaining of materials or services or (c) any liability 
for taxes owed or owing by the Company or any Subsidiary of the Company.


                                      -8-

<PAGE>

          "Shelf Registration Statement" shall have the meaning specified in 
the Registration Rights Agreement.

          "Significant Subsidiary" means any Subsidiary which is a 
"significant subsidiary" of the Company within the meaning of Rule 1-02(w) of 
Regulation S-X under the Securities Act promulgated by the Commission as in 
effect as of the date of the Indenture.

          "Special Record Date" for payment of any Defaulted Interest means a 
date fixed by the Trustee pursuant to Section 2.12.

          "Stated Maturity" when used with respect to any Security, means 
June 1, 2003.

          "Subsidiary" with respect to any Person, means (i) a corporation a 
majority of whose Capital Stock with voting power normally entitled to vote 
in the election of directors is at the time, directly or indirectly, owned by 
such Person, by such Person and one or more Subsidiaries of such Person or by 
one or more Subsidiaries of such Person, (ii) a partnership in which such 
Person or a Subsidiary of such Person is, at the time, a general partner and 
owns alone or together with one or more Subsidiaries of such Person a 
majority of the partnership interests, or (iii) any other Person (other than 
a corporation) in which such Person, one or more Subsidiaries of such Person, 
or such Person and one or more Subsidiaries of such Person, directly or 
indirectly, at the date of determination thereof, has at least majority 
ownership interest.

          "TIA" means the Trust Indenture Act of 1939 (15 U.S. Code 
Sections 77aaa- 77bbbb) as in effect on the date of the execution of this 
Indenture unless otherwise specified herein.

          "Trading Day" means each Monday, Tuesday, Wednesday, Thursday and 
Friday, other than any day on which securities are not traded on the NASDAQ 
National Market (or, if the Common Stock is not admitted to trading thereon, 
on the principal national securities exchange on which the Common Stock is at 
the time listed or admitted to trading).

          "Transfer Restricted Securities" means Securities that bear or are 
required to bear the legend set forth in Section 2.6 hereof.

          "Trustee" means the party named as such in this Indenture until a 
successor replaces it in accordance with the provisions of this Indenture and 
thereafter means such successor.

          "Trust Officer" means any officer within the corporate trust 
division (or any successor group) of the Trustee or any other officer of the 
Trustee customarily performing functions similar to those performed by the 
Persons who at that time shall be such officers, and also means, with respect 
to a particular corporate trust matter, any other 


                                      -9-

<PAGE>

officer of the Trustee to whom such trust matter is referred because of his 
knowledge of and familiarity with the particular subject.

          "U.S. Government Obligations" means direct non-callable obligations 
of, or non-callable obligations that are fully guaranteed by, the United 
States of America, for the payment of which obligation or guarantee the full 
faith and credit of the United States of America is pledged.

          "Voting Stock" means the then outstanding securities entitled to 
vote generally in elections of directors, managers or trustees, as 
applicable, of the Company or any successor entity.

SECTION 1.2.   INCORPORATION BY REFERENCE OF TIA. 

          Whenever this Indenture refers to a provision of the TIA, such 
provision is incorporated by reference in and made a part of this Indenture. 
The following TIA terms used in this Indenture have the following meanings:

          "Commission" means the SEC.

          "indenture securities" means the Securities.

          "indenture securityholder" means a Holder or a Securityholder.

          "indenture to be qualified" means this Indenture.

          "indenture trustee" or "institutional trustee" means the Trustee.

          "obligor" on the indenture securities means the Company and any other
     obligor on the Securities.

          All other TIA terms used in this Indenture that are defined by the 
TIA, defined by TIA reference to another statute or defined by SEC rule and 
not otherwise defined herein have the meanings assigned to them thereby.

SECTION 1.3.   RULES OF CONSTRUCTION.   

          Unless the context otherwise requires:  

          (1)  a term has the meaning assigned to it;

          (2)  an accounting term not otherwise defined has the meaning assigned
     to it in accordance with GAAP;

          (3)  "or" is not exclusive;

          (4)  words in the singular include the plural, and words in the plural
     include the singular;


                                     -10-

<PAGE>

          (5)  provisions apply to successive events and transactions;

          (6)  "herein,"  "hereof" and other words of similar import refer to
     this Indenture as a whole and not to any particular Article, Section or
     other subdivision;

          (7)  references to Sections or Articles mean references to such
     Section or Article in this Indenture, unless stated otherwise; and

          (8)  references to statutes or regulations include successor
     provisions thereto and recodifications thereof unless the context otherwise
     expressly requires.

                                 ARTICLE II.
                                          
                                THE SECURITIES

SECTION 2.1.   FORM AND DATING.

          The Securities and the Trustee's certificate of authentication in 
respect thereof, shall be substantially in the form of Exhibit A hereto, 
which Exhibit is part of this Indenture.  The Securities may have notations, 
legends or endorsements required by law, stock exchange rule or usage.  The 
Company shall approve the form of the Securities and any notation, legend or 
endorsement on them.  Any such notations, legends or endorsements not 
contained in the form of Security attached as Exhibit A hereto shall be 
delivered in writing to the Trustee.  Each Security shall be dated the date 
of its authentication.

          The terms and provisions contained in the forms of Securities shall 
constitute, and are hereby expressly made, a part of this Indenture and, to 
the extent applicable, the Company and the Trustee, by their execution and 
delivery of this Indenture, expressly agree to such terms and provisions and 
to be bound thereby.

          Every Security shall bear interest from the date of initial 
issuance, at the annual rate as specified on the face of the Form of Note 
attached as Exhibit A hereto.  Interest on Securities shall be paid on June 1 
and December 1, commencing December 1, 1998, to Holders of record at the 
close of business on the immediately preceding Record Date unless redeemed, 
repurchased or converted earlier pursuant to the terms of this Indenture. 
Interest on the Securities shall be computed on the basis of a 360-day year 
comprised of twelve 30 day months.

          The Person in whose name any Security (or its predecessor Security) 
is registered at the close of business on any Record Date with respect to any 
Interest Payment Date (including any security that is converted after the 
Record Date and on or before the Interest Payment Date) shall be 


                                     -11-

<PAGE>

entitled to receive the interest payable on such Interest Payment Date 
notwithstanding the cancellation of such Security upon any transfer, exchange 
or conversion subsequent to the Record Date and on or prior to such Interest 
Payment Date. Interest may, at the option of the Company, be paid by check 
mailed to the address of such Person on the Security register; provided that, 
with respect to any Holder of Securities with an aggregate principal amount 
equal to or in excess of $5,000,000, at the request of such Holder in writing 
to the Company at least fifteen (15) days prior to the date set for payment 
of interest (who shall then furnish written notice to such effect to the 
Trustee), interest on such Holder's Securities shall be paid by wire transfer 
in immediately available funds in accordance with the wire transfer 
instructions supplied by such Holder to the Trustee and paying agent (if 
different from the Trustee).

SECTION 2.2.   EXECUTION AND AUTHENTICATION.

          Two Officers shall sign, or one Officer shall sign and one Officer 
shall attest to, the Securities for the Company by manual or facsimile 
signature.

          If an Officer whose signature is on a Security was an Officer at 
the time of such execution but no longer holds that office at the time the 
Trustee authenticates the Security, the Security shall be valid nevertheless 
and the Company shall nevertheless be bound by the terms of the Securities 
and this Indenture.

          A Security shall not be valid until an authorized signatory of the 
Trustee manually signs the certificate of authentication on the Security, but 
such signature shall be conclusive evidence that the Security has been 
authenticated pursuant to the terms of this Indenture.

          The Trustee shall authenticate the Securities for original issue in 
the aggregate principal amount of up to $86,250,000 upon receipt of one or 
more written orders of the Company in the form of an Officers' Certificate.  
The Officers' Certificate shall specify the amount of Securities to be 
authenticated and the date on which the Securities are to be authenticated.  
The aggregate principal amount of Securities outstanding at any time may not 
exceed $86,250,000, except as provided in Section 2.7; provided, that 
Securities in excess of $75,000,000 shall not be issued other than pursuant 
to the over-allotment option granted by the Company to the Initial Purchasers 
as provided in the Purchase Agreement.  Upon the written order of the Company 
in the form of an Officers' Certificate, the Trustee shall authenticate 
Securities in substitution of Securities originally issued to reflect any 
name change of the Company; provided, however, that in connection with the 
Company order for authentication of Securities dated the date hereof, the 
Officers' Certificate and Opinion of Counsel pursuant to Section 13.4 shall 
not be required.


                                     -12-

<PAGE>

          The Trustee may appoint an authenticating agent acceptable to the 
Company to authenticate Securities.  Unless otherwise provided in the 
appointment, an authenticating agent may authenticate Securities whenever the 
Trustee may do so.  Each reference in this Indenture to authentication by the 
Trustee includes authentication by such agent.  An authenticating agent has 
the same rights as an Agent to deal with the Company, any Affiliate of the 
Company, or any of their respective Subsidiaries.

          Securities shall be issuable only in registered form without 
coupons in denominations of $1,000 and any integral multiple thereof.

SECTION 2.3.   REGISTRAR AND PAYING AGENT.   

          The Company shall maintain an office or agency in the Borough of 
Manhattan, The City of New York, where Securities may be presented for 
registration of transfer, conversion or for exchange ("Registrar") and an 
office or agency where Securities may be presented for payment ("Paying 
Agent") and where notices and demands to or upon the Company in respect of 
the Securities may be served.  The Company may act as Registrar or Paying 
Agent, except that, for the purposes of Articles III, VIII and X and as 
otherwise specified in the Indenture, neither the Company nor any Affiliate 
of the Company shall act as Paying Agent.  The Registrar shall keep a 
register of the Securities and of their transfer and exchange and conversion. 
The Company may have one or more co-Registrars and one or more additional 
Paying Agents. The term "Paying Agent" includes any additional Paying Agent. 
The Company hereby initially appoints the Trustee as Registrar, Paying Agent 
and conversion agent, and the Trustee hereby initially agrees so to act.

          The Company shall enter into an appropriate written agency 
agreement with any Agent not a party to this Indenture, which agreement shall 
implement the provisions of this Indenture that relate to such Agent.  The 
Company shall promptly notify the Trustee in writing of the name and address 
of any such Agent. If the Company fails to maintain a Registrar or Paying 
Agent, the Trustee shall act as such.

          The Company initially appoints The Depository Trust Company ("DTC") 
to act as Depositary with respect to the Global Securities.

          The Company initially appoints the Trustee to act as Securities 
Custodian with respect to the Global Securities.  

SECTION 2.4.   PAYING AGENT TO HOLD ASSETS IN TRUST.   

          The Company shall require each Paying Agent other than the Trustee 
to agree in writing that each Paying Agent shall hold in trust for the 
benefit of Holders and the Trustee all assets held by the Paying Agent for 
the payment of any amounts due on the Securities (whether such assets have 
been delivered to it by the Company or any other obligor on the 


                                     -13-

<PAGE>

Securities), and shall notify the Trustee in writing of any Default in making 
any such payment.  If either of the Company or a Subsidiary of the Company 
acts as Paying Agent, it shall segregate such assets and hold them as a 
separate trust fund for the benefit of the Holders and the Trustee.  The 
Company at any time may require a Paying Agent to deliver all assets held by 
it to the Trustee and account for any assets disbursed and the Trustee may at 
any time during the continuance of any payment Default, upon written request 
to a Paying Agent, require such Paying Agent to deliver all assets held by it 
to the Trustee and to account for any assets delivered to it.  Upon delivery 
to the Trustee of all assets that shall have been delivered by the Company to 
the Paying Agent, the Paying Agent (if other than the Company or an Affiliate 
of the Company) shall have no further liability for such assets.

SECTION 2.5.   SECURITYHOLDER LISTS.    

          The Trustee shall preserve in as current a form as is reasonably 
practicable the most recent list available to it of the names and addresses 
of Holders.  If the Trustee is not the Registrar, the Company shall furnish 
to the Trustee on or before the third Business Day preceding each Interest 
Payment Date and at such other times as the Trustee may request in writing a 
list in such form and as of such date as the Trustee reasonably may require 
of the names and addresses of Holders.

SECTION 2.6.   TRANSFER AND EXCHANGE.   

          (a)  GLOBAL SECURITIES.  So long as the Securities are eligible for 
book-entry settlement with the Depositary, unless otherwise required by law, 
all Securities (i) to be traded on the PORTAL Market or (ii) sold (A) to a 
QIB or (B) to an Institutional Accredited Investor that, prior to such 
transfer, is required to furnish to the Trustee a signed letter containing 
certain representations and agreements relating to the restrictions on 
transfer of the Security ("Investment Letter"), shall be represented by one 
or more Global Securities registered in the name of the Depositary or the 
nominee of the Depositary. The transfer and exchange of beneficial interests 
in any Global Security, which does not involve the issuance of a Security in 
certificated form, shall be effected through the Depositary, in accordance 
with this Indenture (including restrictions on transfer set forth herein) and 
the procedures of the Depositary therefor.

          At any time at the request of the beneficial owner of an interest 
in Global Security to obtain a Security in certificated form, such beneficial 
owner shall be entitled to obtain a Security in certificated form upon 
written request to the Trustee in accordance with the standing instructions 
and procedures existing between the Trustee and Depositary for the issuance 
thereof.  Upon receipt of any such request, the Trustee will cause, in 
accordance with the standing instructions and procedures existing between the 
Depositary and the Trustee, the aggregate principal amount of the Global 
Security to be reduced by the principal amount of the Security issued in 
certificated form upon such request to such 


                                     -14-

<PAGE>

beneficial owner and, following such reduction, the Company will execute and 
the Trustee will authenticate and make available for delivery to such 
beneficial owner (or its nominee) a Security or Securities in certificated 
form in the appropriate aggregate principal amount in the name of such 
beneficial owner (or its nominee) as the Holder thereof and bearing such 
restrictive legends as may be required by this Indenture.

          Any transfer of a beneficial interest in the Global Security which 
cannot be effected through book-entry settlement must be effected by the 
delivery to the transferee (or its nominee) of a Security or Securities in 
certificated form registered in the name of the transferee (or its nominee) 
on the books maintained by the Registrar in accordance with the transfer 
restrictions set forth herein.  With respect to any such transfer, the 
Trustee will cause, in accordance with the standing instructions and 
procedures existing between the Depositary and the Trustee, the aggregate 
principal amount of the Global Security to be reduced by the principal amount 
of the respective beneficial interest in the Global Security being 
transferred and, following such reduction, the Company will execute and the 
Trustee will authenticate and make available for delivery to the transferee 
(or such transferee's nominee, as the case may be), a Security or Securities 
in certificated form (bearing such restrictive legends as may be required by 
this Indenture) in the appropriate aggregate principal amount in the name of 
such transferee (or its nominee) as the Holder thereof may request.

          (b)  TRANSFER.  So long as the Securities are eligible for 
book-entry settlement, or unless otherwise required by law, upon any transfer 
of a Security in certificated form to a QIB in accordance with Rule 144A or 
an Institutional Accredited Investor that is required to deliver an 
Investment Letter, and upon receipt of the Security or Securities in 
certificated form being so transferred, together with a certification from 
the transferor that the transferee is a QIB or an Institutional Accredited 
Investor (and, in the case of an Institutional Accredited Investor, that such 
transferee has delivered an Investment Letter), the Trustee shall make an 
endorsement on the Global Security to reflect an increase in the aggregate 
principal amount of the Securities represented by the Global Security, and 
the Trustee shall cancel such Security or Securities in certificated form and 
cause, in accordance with the standing instructions and procedures existing 
between the Depositary and the Trustee, the aggregate principal amount of 
Securities represented by the Global Security to be increased accordingly; 
provided that no Security in certificated form, or portion thereof, in 
respect of which the Company or an Affiliate of the Company held any 
beneficial interest shall be included in the Global Security until such 
Security in certificated form is freely tradable in accordance with Rule 
144(k) and provided, further, that the Trustee shall issue Securities in 
certificated form upon any transfer of a beneficial interest in the Global 
Security to the Securities or an Affiliate of the Company."


                                     -15-

<PAGE>

          Any Global Security may be endorsed with or have incorporated in 
the text thereof such legends or recitals or changes not inconsistent with 
the provisions of this Indenture as may be required by the Depositary or by 
the National Association of Securities Dealers, Inc. in order for the 
Securities to be tradable on the PORTAL Market or as may be required for the 
Securities to be tradable on any other market developed for trading of 
securities pursuant to Rule 144A under the Securities Act or required to 
comply with any applicable law or any regulation thereunder or with the rules 
and regulations of any securities exchange or automated quotation system upon 
which the Securities may be listed or traded or to conform with any usage 
with respect thereto, or to indicate any special limitations or restrictions 
to which any particular Securities are subject.

          (c)  LEGEND ON SECURITIES.  Every Security that bears or is 
required under this Section 2.6(c) to bear the legend set forth in this 
Section 2.6(c) (together with any Common Stock issued upon conversion of the 
Securities and required to bear the legend set forth in Section 2.6(d)), 
shall be subject to the restrictions on transfer set forth in this Section 
2.6(c) (including those set forth in the legend set forth below) unless such 
restrictions on transfer shall be waived by written consent of the Company 
(with written notice to the Trustee), and the Holder of each such Restricted 
Security, by such Securityholder's acceptance thereof, agrees to be bound by 
all such restrictions on transfer.  As used in Section 2.6(c) and 2.6(d), the 
term "transfer" encompasses any sale, pledge, transfer or other disposition 
whatsoever of any Restricted Security.

          Until two years after the original issuance date of any Security, 
any certificate evidencing such Security (and all Securities in exchange 
therefor or substitution thereof, other than Common Stock, if any, issued 
upon conversion thereof, which shall bear the legend set forth in Section 
2.6(d), if applicable) shall bear a legend in substantially the following 
form, unless otherwise agreed by the Company in writing, with written notice 
thereof to the Trustee:

          THE SECURITY EVIDENCED HEREBY HAS NOT BEEN REGISTERED UNDER THE U.S.
     SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE
     SECURITIES LAWS, AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD, EXCEPT AS
     SET FORTH IN THE FOLLOWING SENTENCE.

          BY ITS ACQUISITION HEREOF, THE HOLDER:  (1) REPRESENTS THAT (A) IT IS
     A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE
     SECURITIES ACT) IN COMPLIANCE WITH RULE 144A OR (B) IT IS AN INSTITUTIONAL
     "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(a)(1), (2), (3), OR (7) UNDER
     THE SECURITIES ACT) ("INSTITUTIONAL ACCREDITED INVESTOR"); (2) AGREES THAT
     IT WILL NOT PRIOR TO THE EXPIRATION OF THE HOLDING PERIOD APPLICABLE TO
     SALES OF THE SECURITY EVIDENCED HEREBY UNDER RULE 144(k) 


                                     -16-

<PAGE>

     UNDER THE SECURITIES ACT (THE "RESTRICTION TERMINATION DATE") RESELL OR 
     OTHERWISE TRANSFER THE SECURITY EVIDENCED HEREBY OR THE COMMON STOCK 
     ISSUABLE UPON CONVERSION OF SUCH SECURITY EXCEPT (A) TO THE COMPANY OR 
     ANY SUBSIDIARY THEREOF, (B) TO A QUALIFIED INSTITUTIONAL BUYER IN 
     COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) TO AN 
     INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER, 
     FURNISHES TO THE BANK OF NEW YORK, AS TRUSTEE (OR A SUCCESSOR TRUSTEE, 
     AS APPLICABLE), A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND 
     AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THE SECURITY 
     EVIDENCED HEREBY (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM SUCH 
     TRUSTEE OR A SUCCESSOR TRUSTEE, AS APPLICABLE), (D) PURSUANT TO ANOTHER 
     AVAILABLE EXEMPTION FROM REGISTRATION PROVIDED UNDER THE SECURITIES ACT, 
     OR (E) PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BEEN DECLARED 
     EFFECTIVE UNDER THE SECURITIES ACT (AND WHICH CONTINUES TO BE EFFECTIVE 
     AT THE TIME OF SUCH TRANSFER); AND (3) AGREES THAT IT WILL DELIVER TO 
     EACH PERSON TO WHOM THE SECURITY EVIDENCED HEREBY IS TRANSFERRED A 
     NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND.

          IN CONNECTION WITH ANY TRANSFER OF THE SECURITY EVIDENCED HEREBY
     BEFORE THE RESTRICTION TERMINATION DATE, THE HOLDER MUST CHECK THE
     APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER OF
     SUCH TRANSFER AND SUBMIT THIS SECURITY TO THE BANK OF NEW YORK, AS TRUSTEE
     (OR A SUCCESSOR TRUSTEE, AS APPLICABLE).  IF THE PROPOSED TRANSFER IS
     PURSUANT TO CLAUSE (C) OR (D) ABOVE, THE HOLDER MUST, PRIOR TO SUCH
     TRANSFER, FURNISH TO THE BANK OF NEW YORK, AS TRUSTEE (OR A SUCCESSOR
     TRUSTEE, AS APPLICABLE), SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER
     INFORMATION AS IT MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS
     BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT
     TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT.

          THIS LEGEND WILL BE REMOVED UPON THE EARLIER OF THE TRANSFER OF THE
     SECURITY EVIDENCED HEREBY PURSUANT TO CLAUSE 2(E) ABOVE OR UPON THE
     RESTRICTION TERMINATION DATE. 

          Any Security (or security issued in exchange or substitution therefor)
as to which such restrictions on transfer shall have expired in accordance with
their terms or as to which the conditions for removal of the foregoing legend
set forth therein have been satisfied may, upon surrender of such Security for
exchange to the Registrar in accordance with the provisions of this Section 2.6,
be exchanged for a new Security or Securities, of like tenor and aggregate
principal amount and authorized denominations, which shall not bear the
restrictive legend required by this Section 2.6(c).


                                     -17-

<PAGE>

          Notwithstanding any other provisions of this Indenture (other than 
the provisions set forth in the second paragraph of Section 2.6(a) and in 
this Section 2.6(c)), a Global Security may not be transferred as a whole or 
in part except by the Depositary to a nominee of the Depositary or by a 
nominee of the Depositary to the Depositary or another nominee of the 
Depositary or by the Depositary or any such nominee to a successor Depositary 
or a nominee of such successor Depositary.

          The Depositary shall be a clearing agency registered under the 
Exchange Act.  The Company initially appoints The Depository Trust Company to 
act as Depositary with respect to the Global Securities.  Initially, the 
Global Security shall be issued to the Depositary, registered in the name of 
Cede & Co., as the nominee of the Depositary, and deposited with the 
Securities Custodian on behalf of Cede & Co.

          The Trustee is hereby authorized and requested to execute and 
deliver a Letter of Representation to the Depositary and, in connection with 
any successor nominee for the Depositary or any successor Depositary, enter 
into comparable arrangements, and shall have the same rights with respect to 
its actions thereunder as it has with respect to its actions under this 
Indenture.

          If at any time the Depositary for the Global Security notifies the 
Company that it is unwilling or unable to continue as Depositary for the 
Security, the Company may appoint a successor Depositary with respect to such 
Security.  If a successor Depositary is not appointed by the Company within 
90 days after the Company receives such notice, the Company will execute, and 
the Trustee, upon receipt of an Officers' Certificate for the authentication 
and delivery of Securities, will authenticate and make available for 
delivery, Securities in certificated form, in an aggregate principal amount 
equal to the outstanding principal amount of the Global Security, in exchange 
for the Global Security.

          If a Security in certificated form is issued in exchange for any 
portion of a Global Security after the close of business at the office or 
agency where such exchange occurs on any Record Date and before the opening 
of business at such office or agency on the next succeeding Interest Payment 
Date, interest will not be payable to the Holder on such Interest Payment 
Date in respect of such Security, but will be payable on such Interest 
Payment Date only to the Person to whom interest in respect of such portion 
of such Global Security is payable in accordance with the provisions of this 
Indenture.

          Securities in certificated form issued in exchange for all or a 
part of a Global Security pursuant to this Section 2.6 shall be registered in 
such names and in such authorized denominations as the Depositary, pursuant 
to instruction from its direct or indirect participants or otherwise, shall 
instruct the Trustee in writing.  Upon execution and authentication, the 
Trustee shall make such Securities available for delivery in certificated 
form to the 


                                     -18-

<PAGE>

Person in whose names such Securities in certificated form are so registered.

          At such time as all interests in a Global Security have been 
redeemed, repurchased, converted, canceled, exchanged for Securities in 
certificated form, or transferred to a transferee who receives Securities in 
certificated form, such Global Security shall, upon receipt thereof, be 
canceled by the Trustee. At any time prior to such cancellation, if any 
interest in a Global Security is exchanged for Securities in certificated 
form, redeemed, converted, repurchased or canceled, or transferred to a 
transferee who receives Securities in certificated form therefor or any 
Security in certificated form is exchanged or transferred for part of a 
Global Security, the principal amount of such Global Security shall, in 
accordance with the standing procedures and instructions existing between the 
Depositary and the Custodian, be appropriately reduced or increased, as the 
case may be, and an endorsement shall be made on such Global Security, by the 
Trustee, to reflect such reduction or increase.  In the event of any transfer 
of any beneficial interest between one Global Security and another in 
accordance with the standing procedures and instructions between the 
Depositary and the Trustee and the transfer restrictions required herein, the 
aggregate principal amount of each Global Security shall be appropriately 
increased or decreased, as the case may be, and an endorsement shall be made 
on each Global Security by the Trustee or the Securities Custodian, at the 
direction of the Trustee, to reflect such reduction or increase.

          (d)  LEGEND ON COMMON STOCK.  Until two years after the original 
issuance date of any Security, any stock certificate representing Common 
Stock issued upon conversion of such Security shall bear a legend in 
substantially the following form, unless such Common Stock has been 
transferred pursuant to a registration statement that has been declared 
effective under the Securities Act (and which continues to be effective at 
the time of such transfer) or such Common Stock has been issued upon 
conversion of Securities that have been transferred pursuant to a 
registration statement that has been declared effective under the Securities 
Act, or unless otherwise agreed by the Company in writing with written notice 
thereof to the transfer agent:

          THE COMMON STOCK EVIDENCED HEREBY HAS NOT BEEN REGISTERED UNDER THE
     U.S. SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY
     STATE SECURITIES LAWS, AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD, EXCEPT
     AS SET FORTH IN THE FOLLOWING SENTENCE.

          THE HOLDER HEREOF AGREES THAT UNTIL THE EXPIRATION OF THE HOLDING
     PERIOD APPLICABLE TO SALES OF THE SECURITY EVIDENCED HEREBY UNDER RULE
     144(k) UNDER THE SECURITIES ACT (THE "RESTRICTION TERMINATION DATE"): 
     (1)IT WILL NOT RESELL OR OTHERWISE TRANSFER THE COMMON STOCK EVIDENCED
     HEREBY 


                                     -19-

<PAGE>

     EXCEPT (A) TO THE COMPANY OR ANY SUBSIDIARY THEREOF, (B) TO A "QUALIFIED 
     INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) 
     IN COMPLIANCE WITH RULE 144A, (C) TO AN INSTITUTIONAL "ACCREDITED 
     INVESTOR" (AS DEFINED IN RULE 501(a)(1), (2), (3) OR (7) UNDER THE 
     SECURITIES ACT) THAT, PRIOR TO SUCH TRANSFER, FURNISHES TO THE BANK OF 
     NEW YORK, AS TRANSFER AGENT (OR A SUCCESSOR TRANSFER AGENT, AS 
     APPLICABLE), A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND 
     AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THE COMMON STOCK 
     EVIDENCED HEREBY (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM SUCH 
     TRANSFER AGENT OR A SUCCESSOR TRANSFER AGENT, AS APPLICABLE), (D) 
     PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM REGISTRATION PROVIDED UNDER 
     THE SECURITIES ACT, OR (E) PURSUANT TO A REGISTRATION STATEMENT WHICH 
     HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT (AND WHICH 
     CONTINUES TO BE EFFECTIVE AT THE TIME OF SUCH TRANSFER); (2) PRIOR TO 
     SUCH TRANSFER BEFORE THE RESTRICTION TERMINATION DATE (OTHER THAN A 
     TRANSFER PURSUANT TO CLAUSE 1(E) ABOVE), IT WILL FURNISH THE BANK OF NEW 
     YORK, AS TRANSFER AGENT (OR A SUCCESSOR TRANSFER AGENT, AS APPLICABLE), 
     SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS IT MAY 
     REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT 
     TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE 
     REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND (3) IT WILL DELIVER 
     TO EACH PERSON TO WHOM THE COMMON STOCK EVIDENCED HEREBY IS TRANSFERRED 
     (OTHER THAN A TRANSFER PURSUANT TO CLAUSE 1(E) ABOVE) A NOTICE 
     SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND.

          THIS LEGEND WILL BE REMOVED UPON THE EARLIER OF THE TRANSFER OF THE
     COMMON STOCK EVIDENCED HEREBY PURSUANT TO CLAUSE 1(E) ABOVE OR UPON THE
     RESTRICTION TERMINATION DATE. 

          Any such Common Stock as to which such restrictions on transfer 
shall have expired in accordance with their terms or as to which the 
conditions for removal of the foregoing legend set forth therein have been 
satisfied may, upon surrender of the certificates representing such shares of 
Common Stock for exchange in accordance with the procedures of the transfer 
agent for the Common Stock, be exchanged for a new certificate or 
certificates for a like number of shares of Common Stock, which shall not 
bear the restrictive legend required by this Section 2.6(d).

          (e)  CANCELLATION AND/OR ADJUSTMENT OF GLOBAL SECURITY.  At such 
time as all beneficial interests in a Global Security have either been 
exchanged for Definitive Securities, redeemed, repurchased or canceled, such 
Global Security shall be returned to or retained and canceled by the Trustee. 
At any time prior to such cancellation, if any beneficial interest in a 
Global Security is exchanged for Definitive Securities, redeemed, repurchased 
or canceled, the 


                                     -20-

<PAGE>

principal amount of Securities represented by such Global Security shall be 
reduced and an endorsement shall be made on such Global Security, by the 
Trustee or the Securities Custodian, at the direction of the Trustee, to 
reflect such reduction.

          (f)  OBLIGATIONS WITH RESPECT TO TRANSFERS AND EXCHANGES OF 
DEFINITIVE SECURITIES AND GLOBAL SECURITIES.

          (i)    To permit registrations of transfers and exchanges, the 
Company shall execute and the Trustee shall authenticate Definitive 
Securities and Global Securities at the Registrar's or co-Registrar's request.

          (ii)   No service charge shall be made for any registration of 
transfer or exchange, but the Company may require payment of a sum sufficient 
to cover any transfer tax, assessments, or similar governmental charge 
payable in connection therewith (other than any such transfer taxes, 
assessments, or similar governmental charge payable upon exchanges or 
transfers pursuant to Section 2.2 (fourth paragraph), 2.10, 3.7, 9.5 or 10.1 
(final paragraph)).

          (iii)  The Registrar or co-Registrar shall not be required to 
register the transfer or exchange of (a) any Definitive Security selected for 
redemption in whole or in part pursuant to Article III, except the unredeemed 
portion of any Definitive Security being redeemed in part, (b) any Security 
for a period beginning 15 days before the mailing of a notice of a Repurchase 
Offer pursuant to Article X hereof or the mailing of a notice of redemption 
of Securities pursuant to Article III hereof and ending at the close of 
business on the day of such mailing or (c) any Security or portion thereof 
surrendered for conversion pursuant to Article XII.

          Each Holder of a Security agrees to indemnify the Company and the 
Trustee against any liability that may result from the transfer, exchange or 
assignment of such Holder's Security in violation of any provision of this 
Indenture and/or applicable United States federal or state securities law.

          The Trustee shall have no obligation or duty to monitor, determine 
or inquire as to compliance with any restrictions on transfer imposed under 
this Indenture or under applicable law with respect to any transfer of any 
interest in any Security (including any transfers between or among Depositary 
participants or beneficial owners of interests in any Global Security) other 
than to require delivery of such certificates and other documentation or 
evidence as are expressly required by, and to do so if and when expressly 
required by the terms of, this Indenture (including to the extent such 
requirement is at the discretion of the Company), and to examine the same to 
determine substantial compliance as to form with the express requirements 
hereof.


                                     -21-

<PAGE>

SECTION 2.7.   REPLACEMENT SECURITIES.  

          If a mutilated Security is surrendered to the Trustee or if the 
Holder of a Security claims and submits an affidavit or other evidence, 
satisfactory to the Trustee, to the Trustee to the effect that the Security 
has been lost, destroyed or wrongfully taken, the Company shall issue and the 
Trustee shall authenticate a replacement Security (bearing a number not 
contemporaneously outstanding) if the Trustee's requirements are met.  Such 
Holder must provide an indemnity bond or other indemnity, sufficient in the 
judgment of both the Company and the Trustee, to protect the Company, the 
Trustee or any Agent from any loss which any of them may suffer if a Security 
is replaced.  The Company may charge such Holder for its reasonable, 
out-of-pocket expenses in replacing a Security.

          In case any such mutilated, destroyed, lost or stolen Security has 
become or is about to become due and payable, the Company in its discretion, 
but subject to any conversion rights, may, instead of issuing a new Security, 
pay such Security, upon satisfaction of the conditions set forth in the 
preceding paragraph.

          Every new Security issued pursuant to this Section 2.7 in lieu of 
any mutilated, destroyed, lost or stolen Security shall constitute an 
original additional contractual obligation of the Company, whether or not the 
mutilated, destroyed, lost or stolen Security shall be at any time 
enforceable by anyone, and such new Security shall be entitled to all the 
benefits of this Indenture equally and proportionately with any and all other 
Securities duly issued hereunder.

          The provisions of this Section 2.7 are exclusive and shall preclude 
(to the extent lawful) all other rights and remedies of any Holder with 
respect to the replacement or payment of mutilated, destroyed, lost or stolen 
Securities.

SECTION 2.8.   OUTSTANDING SECURITIES.  

          Securities outstanding at any time are all the Securities that have 
been authenticated by the Trustee (including any Security represented by a 
Global Security) except those canceled by it, those delivered to it for 
cancellation or conversion, those paid pursuant to Section 2.7, those 
reductions in the interest in a Global Security effected by the Trustee 
hereunder and those described in this Section 2.8 as not outstanding.  A 
Security does not cease to be outstanding because the Company or an Affiliate 
of the Company holds the Security, except as provided in Section 2.9.

          If a Security is replaced pursuant to Section 2.7 (other than a 
mutilated Security surrendered for replacement), it ceases to be outstanding 
unless the Trustee receives proof satisfactory to it that the replaced 
Security is held by a protected purchaser.  A mutilated Security ceases to be 


                                      -22-

<PAGE>

outstanding upon surrender of such Security and replacement thereof pursuant 
to Section 2.7.

          If on a Redemption Date the Paying Agent (other than the Company or 
an Affiliate of the Company) holds Cash or U.S. Government Obligations 
sufficient to pay all of the principal and interest due on the Securities 
payable on that date in accordance with Section 3.6 hereof and payment of the 
Securities called for redemption is not otherwise prohibited pursuant to 
Article XI hereof or otherwise, then on and after that date such Securities 
cease to be outstanding and interest on them ceases to accrue.

SECTION 2.9.   TREASURY SECURITIES.     

          In determining whether the Holders of the required principal amount 
of Securities have concurred in any direction, amendment, supplement, waiver 
or consent, Securities owned by the Company or an Affiliate of the Company 
shall be disregarded, except that, for the purposes of determining whether 
the Trustee shall be protected in relying on any such direction, amendment, 
supplement, waiver or consent, only Securities that a Trust Officer of the 
Trustee actually knows are so owned shall be disregarded.

SECTION 2.10.  TEMPORARY SECURITIES.    

          Pending the preparation of Definitive Securities in certificated 
form, the Company may execute and the Trustee or an authenticating agent 
appointed by the Trustee shall, upon the written request of the Company, 
authenticate and make available for delivery, temporary Securities.  
Temporary Securities shall be issuable in any authorized denomination, and 
substantially in the form of the Definitive Securities in certificated form, 
but with such omissions, insertions and variations as may be appropriate for 
temporary Securities, all as may be determined by the Company.

          Every such temporary Security shall be executed by the Company and 
authenticated by the Trustee or such authenticating agent upon the same 
conditions and in substantially the same manner, and with the same effect, as 
the Definitive Securities in certificated form.  Without unreasonable delay 
the Company will execute and deliver to the Trustee or such authenticating 
agent Definitive Securities in certificated form (other than in the case of 
Securities in global form) and thereupon any or all temporary Securities 
(other than in the case of Securities in global form) may be surrendered in 
exchange therefor, at each office or agency maintained by the Company 
pursuant to Section 4.2 and the Trustee or such authenticating agent shall 
authenticate and make available for delivery in exchange for such temporary 
Securities an equal aggregate principal amount of Definitive Securities in 
certificated form.  Such exchange shall be made by the Company at its own 
expense and without any charge therefor.


                                     -23-

<PAGE>

          Until so exchanged, the temporary Securities shall in all respects 
be entitled to the same benefits and subject to the same limitations under 
this Indenture as Definitive Securities in certificated form authenticated 
and delivered hereunder.

SECTION 2.11.  CANCELLATION.  

          The Company at any time may deliver Securities to the Trustee for 
cancellation.  The Registrar and the Paying Agent shall forward to the 
Trustee any Securities surrendered to them for transfer, exchange or payment. 
The Trustee, or at the direction of the Trustee, the Registrar or the Paying 
Agent (other than the Company or an Affiliate of the Company), and no one 
else, shall cancel and dispose of all Securities surrendered for transfer, 
exchange, payment or cancellation in accordance with its customary practices, 
unless otherwise requested by the Company; provided, however, that the 
Trustee shall not be required to destroy such canceled Securities.  Subject 
to Section 2.7, the Company may not issue new Securities to replace 
Securities that have been paid or delivered to the Trustee for cancellation.  
No Securities shall be authenticated in lieu of or in exchange for any 
Securities canceled as provided in this Section 2.11, except as expressly 
permitted in the form of Securities and as permitted by this Indenture.

SECTION 2.12.  INTEREST AND DEFAULTED INTEREST.   

          Interest and any Liquidated Damages on any Security which are 
payable, and are punctually paid or duly provided for, on any Interest 
Payment Date shall be paid to the Person in whose name that Security (or one 
or more predecessor Securities) is registered at the close of business on the 
Record Date immediately preceding such Interest Payment Date.

          Any interest or Liquidated Damages on any Security which are 
payable, but are not punctually paid or duly provided for, on any Interest 
Payment Date plus, to the extent lawful, any interest payable on such 
defaulted amounts (collectively, herein called "Defaulted Interest") shall 
forthwith cease to be payable to the registered Holder on the relevant Record 
Date, and such Defaulted Interest shall be paid by the Company, at its 
election in each case, as provided in clause (1) or (2) below:

          (1)  The Company may elect to make payment of any Defaulted 
Interest to the Persons in whose names the Securities (or their respective 
predecessor Securities) are registered at the close of business on a Special 
Record Date for the payment of such Defaulted Interest, which shall be fixed 
in the following manner.  The Company shall notify the Trustee in writing of 
the amount of Defaulted Interest proposed to be paid on each Security and the 
date of the proposed payment, and at the same time the Company shall deposit 
with the Trustee an amount of Cash equal to the aggregate amount proposed to 
be paid in respect of such Defaulted Interest or shall make arrangements 
satisfactory to 


                                     -24-

<PAGE>

the Trustee for such deposit prior to the date of the proposed payment, such 
Cash when deposited to be held in trust for the benefit of the Persons 
entitled to such Defaulted Interest as provided in this clause (1).  
Thereupon the Trustee shall fix a Special Record Date for the payment of such 
Defaulted Interest which shall be not more than 15 days and not less than 10 
days prior to the date of the proposed payment and not less than 10 days 
after the receipt by the Trustee of the notice of the proposed payment.  The 
Trustee shall promptly notify the Company of such Special Record Date and, in 
the name and at the expense of the Company, shall cause notice of the 
proposed payment of such Defaulted Interest and the Special Record Date 
therefor to be mailed, first-class postage prepaid, to each Holder at his 
address as it appears in the Security register not less than 10 days prior to 
such Special Record Date. Notice of the proposed payment of such Defaulted 
Interest and the Special Record Date therefor having been mailed as 
aforesaid, such Defaulted Interest shall be paid to the Persons in whose 
names the Securities (or their respective predecessor Securities) are 
registered at the close of business on such Special Record Date and shall no 
longer be payable pursuant to the following clause (2).

          (2)  The Company may make payment of any Defaulted Interest in any 
other lawful manner not inconsistent with the requirements of any securities 
exchange or automated quotation system on which the Securities may be listed 
or quoted and upon such notice as may be required by such exchange or 
automated quotation system, if, after notice given by the Company to the 
Trustee of the proposed payment pursuant to this clause, such manner shall be 
deemed practicable by the Trustee.

          Subject to the foregoing provisions of this Section 2.12, each 
Security delivered under this Indenture upon transfer of or in exchange for 
or in lieu of any other Security shall carry the rights to interest accrued 
and unpaid, and to accrue, which were carried by such predecessor Security.

SECTION 2.13   CUSIP NUMBERS.

          The Company in issuing the Securities may use "CUSIP" numbers (if 
then generally in use), and, if so, the Trustee shall use "CUSIP" numbers in 
notices of redemption as a convenience to Holders; PROVIDED that any such 
notice may state that no representation is made as to the correctness of such 
numbers either as printed on the Securities or as contained in any notice of 
a redemption and that reliance may be placed only on the other identification 
numbers printed on the Securities, and any such redemption shall not be 
affected by any defect in or omission of such numbers.  The Company will 
promptly notify the Trustee of any change in the "CUSIP" numbers.


                                     -25-

<PAGE>
                                       
                                  ARTICLE III.
                                          
                                   REDEMPTION

SECTION 3.1.   RIGHT OF REDEMPTION.     

          Redemption of Securities, as permitted by any provision of this 
Indenture, shall be made in accordance with Paragraph 5 of the Securities and 
this Article III.  The Company will not have the right to redeem any 
Securities prior to June 1, 2001.  On or after June 1, 2001, the Company will 
have the right to redeem all or any part of the Securities at the Redemption 
Prices specified in Paragraph 5 of the Securities under the caption 
"Redemption", in each case including accrued and unpaid interest and any 
Liquidated Damages to, but excluding, the Redemption Date.

SECTION 3.2.   NOTICES TO TRUSTEE. 

          If the Company elects to redeem Securities, it shall notify the 
Trustee in writing of the Redemption Date and the principal amount of 
Securities to be redeemed and whether it wants the Trustee to give notice of 
redemption to the Holders.

          If the Company elects to reduce the principal amount of Securities 
to be redeemed by crediting against any such redemption Securities it has not 
previously delivered to the Trustee for cancellation, it shall so notify the 
Trustee of the amount of the reduction and deliver such Securities with such 
notice.

          The Company shall give each notice to the Trustee provided for in 
this Section 3.2 at least 45 days before the Redemption Date (unless a 
shorter notice shall be satisfactory to the Trustee).  Any such notice may be 
canceled at any time prior to notice of such redemption being mailed to any 
Holder and shall thereupon be void and of no effect.     

SECTION 3.3.   SELECTION OF SECURITIES TO BE REDEEMED. 

          If less than all of the outstanding Securities are to be redeemed 
on any Redemption Date, the Trustee shall select the Securities or portions 
thereof to be redeemed by lot, on a pro rata basis or by such other method as 
the Trustee shall determine to be fair and appropriate and in such manner as 
complies with any applicable depositary, legal and stock exchange or 
automated quotation system requirements.

          The Trustee shall make the selection from the Securities 
outstanding and not previously called for redemption and shall promptly 
notify the Company in writing of the Securities or portions thereof selected 
for redemption and, in the case of any Security selected for partial 
redemption, the principal amount thereof to be redeemed.  Securities in 
denominations of $1,000 may be redeemed only in whole.  The Trustee may 
select for redemption portions (equal to $1,000 or any integral multiple 
thereof) of the principal of Securities that have denominations larger than 
$1,000.  

                                     -26-
<PAGE>

Provisions of this Indenture that apply to Securities called for redemption 
also apply to portions of Securities called for redemption.

SECTION 3.4.   NOTICE OF REDEMPTION.    

          At least 20 days prior to a Redemption Date, the Company shall send 
a notice of redemption to the Trustee and each Holder whose Securities are to 
be redeemed.  At the Company's request, the Trustee shall give the notice of 
redemption in the Company's name and at the Company's expense.  Each notice 
for redemption shall identify the Securities or portions thereof to be 
redeemed and shall state:

          (1)  the Redemption Date, and that the Securities called for 
     redemption may not be converted after the close of business on the 
     Business Day immediately prior to the Redemption Date (unless the 
     Company defaults in the payment of the Redemption Price);

          (2)  the Redemption Price, including the amount of accrued and 
     unpaid interest and any Liquidated Damages to be paid upon such 
     redemption;

          (3)  the name, address and telephone number of the Paying Agent;"

          (4)  that Securities called for redemption must be surrendered to 
     the Paying Agent at the address specified in such notice to collect the 
     Redemption Price;

          (5)  that, unless (a) the Company defaults in its obligation to 
     deposit Cash with the Paying agent in accordance with Section 3.6 hereof 
     or (b) such redemption payment is prohibited pursuant to Article XI 
     hereof or otherwise, interest and any Liquidated Damages on Securities 
     called for redemption ceases to accrue on and after the Redemption Date 
     and the only remaining right of the Holders of such Securities is to 
     receive payment of the Redemption Price, including accrued and unpaid 
     interest and any Liquidated Damages to, but excluding, the Redemption 
     Date, upon surrender to the Paying Agent of the Securities called for 
     redemption and to be redeemed;

          (6)  if any Security is being redeemed in part, the portion of the 
     principal amount, equal to $1,000 or any integral multiple thereof, of 
     such Security to be redeemed and that, after the Redemption Date, and 
     upon surrender of such Security, a new Security or Securities in 
     aggregate principal amount equal to the unredeemed portion thereof will 
     be issued;

          (7)  if less than all the Securities are to be redeemed, the 
     identification of the particular Securities (or portions thereof) to be 
     redeemed, as 

                                      -27-
<PAGE>

     well as the aggregate principal amount of such Securities to be redeemed 
     and the aggregate principal amount of Securities to be outstanding after 
     such partial redemption;

          (8)  the CUSIP number of the Securities to be redeemed; and

          (9)  that the notice is being sent pursuant to this Section 3.4 and 
     pursuant to the redemption provisions of Paragraph 5 of the Securities.

SECTION 3.5.   EFFECT OF NOTICE OF REDEMPTION.    

          Once notice of redemption is mailed in accordance with Section 3.4, 
Securities called for redemption shall become due and payable on the 
Redemption Date at the Redemption Price, including accrued and unpaid 
interest and any Liquidated Damages to, but excluding, the Redemption Date.  
Upon surrender to the Trustee or Paying Agent, such Securities called for 
redemption shall be paid at the Redemption Price, including accrued and 
unpaid interest and any Liquidated Damages to, but excluding, the Redemption 
Date; provided that if the Redemption Date is after a Record Date and on or 
prior to the corresponding Interest Payment Date, accrued interest and any 
Liquidated Damages shall be payable to the Holder of the redeemed Securities 
at the close of business on the relevant Record Date; and provided, further, 
that if a Redemption Date is not a Business Day, payment shall be made on the 
next succeeding Business Day and no interest shall accrue for the period from 
such Redemption Date to such succeeding Business Day.

SECTION 3.6.   DEPOSIT OF REDEMPTION PRICE.  

          On or prior to 10:30 a.m. New York City time, on the Redemption 
Date, the Company shall deposit with the Paying Agent (other than the Company 
or an Affiliate of the Company) Cash sufficient to pay all amounts due on all 
Securities to be redeemed on such Redemption Date (other than Securities or 
portions thereof called for redemption on that date that have been delivered 
by the Company to the Trustee for cancellation).  The Paying Agent shall 
promptly return to the Company any Cash so deposited which is not required 
for that purpose upon the written request of the Company.

          If the Company complies with the preceding paragraph and the other
provisions of this Article III and payment of the Securities called for
redemption is not prohibited under Article XI or otherwise, interest and any
Liquidated Damages on the Securities to be redeemed will cease to accrue on and
after the applicable Redemption Date, whether or not such Securities are
presented for payment.  Notwithstanding anything herein to the contrary, if any
Security surrendered for redemption in the manner provided in the Securities
shall not be so paid upon surrender for redemption because of the failure of the
Company to comply with the preceding paragraph, interest and, if applicable,
Liquidated Damages shall continue 

                                      -28-
<PAGE>

to accrue and be paid from the Redemption Date until such payment is made on 
the unpaid principal, and, to the extent lawful, on any interest not paid on 
such unpaid principal, in each case at the rate and in the manner provided in 
Section 4.1 hereof and the Security.

SECTION 3.7.   SECURITIES REDEEMED IN PART.  

          Upon surrender of a Security that is to be redeemed in part, the 
Company shall execute and the Trustee shall authenticate and deliver to the 
Holder, without service charge to the Holder, a new Security or Securities 
equal in principal amount to the unredeemed portion of the Security 
surrendered.

SECTION 3.8.   CONVERSION ARRANGEMENT ON CALL FOR REDEMPTION.    

          In connection with any redemption of the Securities, the Company may
arrange for the purchase and conversion of any of the Securities by an agreement
with one or more investment bankers or other purchasers to purchase such
Securities by paying to the Trustee in trust for the Holders, on or before the
date fixed for redemption, an amount not less than the applicable Redemption
Price, together with interest accrued and any Liquidated Damages to (but
excluding) that Redemption Date, of such Securities.  Notwithstanding anything
to the contrary contained in this Article III, the obligation of the Company to
pay the Redemption Price of such Securities, together with interest accrued and
any Liquidated Damages to (but excluding) the date fixed for redemption, shall
be deemed to be satisfied and discharged to the extent such amount is so paid by
such purchasers.  If such an agreement is entered into (a copy of which shall be
filed with the Trustee prior to the date fixed for redemption), any Securities
not duly surrendered for conversion by the Holders thereof, may, at the option
of the Company, be deemed, to the fullest extent permitted by law, acquired by
such purchasers from such Holders and surrendered by such purchasers for
conversion, all as of immediately prior to the close of business on the
Redemption Date (and the right to convert any such Securities shall be extended
through such time), subject to payment of the above amount as aforesaid.  At the
written direction of the Company, the Trustee shall hold and dispose of any such
amount paid to it in the same manner as it would moneys deposited with it by the
Company for the redemption of the Securities.  Without the Trustee's prior
written consent, no arrangement between the Company and such purchasers for the
purchase and conversion of any Securities shall increase or otherwise affect any
of the powers, duties, responsibilities or obligations of the Trustee as set
forth in this Indenture, and the Company agrees to indemnify the Trustee from,
and hold it harmless against, any loss, liability or expense arising out of or
in connection with any such arrangement for the purchase and conversion of any
of the Securities between the Company and such purchasers to which the Trustee
has not consented in writing, including the costs and expenses, including
reasonable legal fees, incurred by the Trustee in the defense of any claim or
liability arising out of or in connection with the exercise or performance of
any of its 

                                       -29-
<PAGE>

powers, duties, responsibilities or obligations under this Indenture.

                                  ARTICLE IV.
                                          
                                   COVENANTS

SECTION 4.1.   PAYMENT OF SECURITIES.   

          The Company shall pay the principal, Redemption Price or Repurchase 
Price of and interest and any Liquidated Damages on the Securities on the 
dates and in the manner provided in the Securities and, in the case of 
Liquidated Damages, in the Registration Rights Agreement.  A payment of any 
amount due on the Securities shall be considered paid on the date it is due 
if the Trustee or Paying Agent (other than the Company or an Affiliate of the 
Company) holds for the benefit of the Holders, on or before 10:00 a.m. New 
York City time on that date, Cash deposited and designated for and sufficient 
to pay the applicable amount.

          The Company shall pay interest on overdue principal, Redemption 
Price or Repurchase Price and on overdue installments of interest and any 
Liquidated Damages at the rate specified in the Securities, compounded 
semi-annually, to the extent lawful.

SECTION 4.2.   MAINTENANCE OF OFFICE OR AGENCY.   

          The Company shall maintain in the Borough of Manhattan, The City of 
New York, an office or agency where Securities may be presented or 
surrendered for payment, where Securities may be surrendered for registration 
of transfer or exchange and for conversion and where notices and demands to 
or upon the Company in respect of the Securities and this Indenture may be 
served.  The Company shall give prompt written notice to the Trustee of the 
location, and any change in the location, of such office or agency.  If at 
any time the Company shall fail to maintain any such required office or 
agency or shall fail to furnish the Trustee with the address thereof, such 
presentations, surrenders, notices and demands may be made or served at the 
address of the Trustee set forth in Section 13.2.

          The Company may also from time to time designate one or more other 
offices or agencies where the Securities may be presented or surrendered for 
any or all such purposes and may from time to time rescind such designations; 
provided, however, that no such designation or rescission shall in any manner 
relieve the Company of its obligation to maintain an office or agency in the 
Borough of Manhattan, The City of New York, for such purposes.  The Company 
shall give prompt written notice to the Trustee of any such designation or 
rescission and of any change in the location of any such other office or 
agency. The Company hereby initially designates the principal corporate trust 
office of the Trustee as such office.

                                      -30-
<PAGE>

SECTION 4.3.   CORPORATE EXISTENCE.     

          Subject to Article V, the Company shall do or cause to be done all 
things necessary to preserve and keep in full force and effect its corporate 
existence and the corporate or other existence of each of its Significant 
Subsidiaries in accordance with the respective organizational documents of 
each of them and the rights (charter and statutory) and corporate franchises 
of the Company and each of its Significant Subsidiaries; provided, however, 
that the Company shall not be required to preserve, with respect to itself, 
any right or franchise, and with respect to any of its Significant 
Subsidiaries, any such existence, right or franchise, if (a) the Company 
shall, in good faith, reasonably determine that the preservation thereof is 
no longer desirable in the conduct of the business of such entity and (b) the 
loss thereof is not disadvantageous in any material respect to the Holders.

SECTION 4.4.   PAYMENT OF TAXES AND OTHER CLAIMS. 

          Except with respect to immaterial items, the Company shall, and 
shall cause each of its Subsidiaries to, pay or discharge or cause to be paid 
or discharged, before the same shall become delinquent, (i) all taxes, 
assessments and governmental charges (including withholding taxes and any 
penalties, interest and additions to taxes) levied or imposed upon the 
Company or any of its Subsidiaries or any of their respective properties and 
(ii) all lawful claims, whether for labor, materials, supplies, services or 
anything else, which have become due and payable and which by law have or may 
become a Lien upon the property and assets of the Company or any of its 
Subsidiaries; provided, however, that neither the Company nor any Subsidiary 
shall be required to pay or discharge or cause to be paid or discharged any 
such tax, assessment, charge or claim whose amount, applicability or validity 
is being contested in good faith by appropriate proceedings and for which 
disputed amounts adequate reserves have been established in accordance with 
GAAP.

SECTION 4.5.   MAINTENANCE OF PROPERTIES AND INSURANCE.     

          The Company shall cause all material properties used or useful to 
the conduct of its business and the business of each of its Subsidiaries to 
be maintained and kept in good condition, repair and working order 
(reasonable wear and tear excepted) and supplied with all necessary equipment 
and shall cause to be made all necessary repairs, renewals, replacements, 
betterments and improvements thereof, all as in its reasonable good faith 
judgment may be necessary, so that the business carried on in connection 
therewith may be properly conducted at all times; provided, however, that 
nothing in this Section 4.5 shall prevent the Company or any Subsidiary from 
discontinuing any operation or maintenance of any of such properties, or 
disposing of any of them, if such discontinuance or disposal is (a) in the 
judgment of the Company, desirable in the conduct of the business of such 
entity and (b) not disadvantageous in any material respect to the Holders.

                                     -31-
<PAGE>

          The Company shall provide, or cause to be provided, for itself and 
each of its Subsidiaries, insurance (including appropriate self-insurance) 
against loss or damage of the kinds that, in the reasonable, good faith 
judgment of the Company is adequate and appropriate for the conduct of the 
business of the Company and such Subsidiaries in a prudent manner, with 
(except for self-insurance) reputable insurers or with the government of the 
United States of America or an agency or instrumentality thereof, in such 
amounts, with such deductibles, and by such methods as shall be customary, in 
the reasonable, good faith judgment of the Company and adequate and 
appropriate for the conduct of the business of the Company and such 
Subsidiaries in a prudent manner for entities similarly situated in the 
industry, unless failure to provide such insurance (together with all other 
such failures) would not have a material adverse effect on the financial 
condition or results of operations of the Company and the Subsidiaries, taken 
as a whole.

SECTION 4.6.   COMPLIANCE CERTIFICATE; NOTICE OF DEFAULT.   

          (a)  The Company shall deliver to the Trustee within 90 days after 
the end of its fiscal year an Officers' Certificate, one of the signers of 
which shall be the principal executive officer, principal financial officer 
or principal accounting officer of the Company, complying with Section 
314(a)(4) of the TIA and stating that a review of its activities and the 
activities of its Subsidiaries during the preceding fiscal year has been made 
under the supervision of the signing Officers with a view to determining 
whether the Company has kept, observed, performed and fulfilled its 
obligations under this Indenture and further stating, as to each such Officer 
signing such certificate, whether or not the signer knows of any failure by 
the Company or any Subsidiary of the Company to comply with any conditions or 
covenants in this Indenture (determined without regard to any period of grace 
or requirement of notice) and, if such signer does know of such a failure to 
comply, the certificate shall describe such failure with particularity.  The 
Officers' Certificate shall also notify the Trustee should the relevant 
fiscal year end on any date other than the current fiscal year end date.

          (b)  The Company shall, so long as any of the Securities are 
outstanding, deliver to the Trustee, promptly upon becoming aware of any 
Default, Event of Default or fact which would prohibit the making of any 
payment to or by the Trustee in respect of the Securities, an Officers' 
Certificate specifying such Default, Event of Default or fact and what action 
the Company is taking or proposes to take with respect thereto.  The Trustee 
shall not be deemed to have knowledge of any Default, any Event of Default or 
any such fact unless one of its Trust Officers receives notice thereof from 
the Company or any of the Holders.

SECTION 4.7.   REPORTS.  

          Whether or not the Company is subject to the reporting requirements of
Section 13 or 15(d) of the Exchange 

                                      -32-
<PAGE>

Act, the Company shall deliver to the Trustee and to each Holder and to 
prospective purchasers of Securities identified to the Company by an Initial 
Purchaser, within 15 days after it is or would have been required to file 
such with the SEC, annual and quarterly consolidated financial statements 
substantially equivalent to financial statements that would have been 
included in reports filed with the SEC if the Company were subject to the 
requirements of Section 13 or 15(d) of the Exchange Act, including, with 
respect to annual information only, a report thereon by the Company's 
independent certified public accountants as such would be required in such 
reports to the SEC and, in each case, together with a management's discussion 
and analysis of financial condition and results of operations which would be 
so required.  In addition, the Company shall file with the Trustee and the 
SEC, and transmit to holders of Securities, such information, documents and 
other reports and such summaries thereof, as may be required pursuant to the 
TIA at the times and in the manner provided pursuant to such Act.

          Delivery of such reports, information and documents to the Trustee 
is for informational purposes only and the Trustee's receipt of such shall 
not constitute constructive notice of any information contained therein or 
determinable from information contained therein, including the Company's 
compliance with any of its covenants hereunder (as to which the Trustee is 
entitled to rely exclusively on Officers' Certificates).

SECTION 4.8.  LIMITATION ON STATUS AS INVESTMENT COMPANY.

          Neither the Company nor any of its Subsidiaries shall become an 
"investment company" (as that term is defined in the Investment Company Act 
of 1940 as amended), or otherwise become subject to regulation under the 
Investment Company Act.

SECTION 4.9.  WAIVER OF STAY, EXTENSION AND USURY LAWS.

          The Company covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, plead, or in any manner whatsoever claim or
take the benefit or advantage of, any stay or extension law or any usury law or
other law which would prohibit or forgive the Company from paying all or any
portion of the principal Redemption Price or Repurchase Price of, or interest
on, the Securities as contemplated herein, wherever enacted, now or at any time
hereafter in force, or which may affect the covenants or the performance of this
Indenture; and (to the extent that it may lawfully do so) the Company hereby
expressly waives all benefit or advantage of any such law, and covenants that it
will not hinder, delay or impede the execution of any power herein granted to
the Trustee, but will suffer and permit the execution of every such power as
though no such law had been enacted.

                                       -33-
<PAGE>

SECTION 4.10.  RULE 144A INFORMATION REQUIREMENT.

          If at any time there are Transfer Restricted Securities outstanding 
and the Company shall cease to have a class of equity securities registered 
under Section 12(g) of the Exchange Act or shall cease to be subject to 
Section 15(d) of the Exchange Act, the Company shall furnish to the Holders 
or beneficial holders of the Securities or the underlying Common Stock and 
prospective purchasers of Securities or the underlying Common Stock 
designated by the Holders of Transfer Restricted Securities, upon their 
request, the information required to be delivered pursuant to Rule 144A(d)(4) 
under the Securities Act until such time as the Shelf Registration Statement 
has become effective under the Securities Act.  The Company shall also 
furnish such information during the pendency of any suspension of 
effectiveness of the Shelf Registration Statement.

SECTION 4.11.  QUALIFICATION OF INDENTURE.

          The Company shall qualify this Indenture under the TIA in 
accordance with the terms and conditions of the Registration Rights Agreement 
and shall pay all costs and expenses (including attorneys' fees and expenses 
for the Company and the Trustee) incurred in connection therewith, including, 
but not limited to, costs and expenses of qualification of the Indenture and 
the Securities and printing this Indenture and the Securities.

SECTION 4.12.  REGISTRATION RIGHTS.

          The Holders of the Securities are entitled to certain registration 
rights with respect to such Securities and Common Stock pursuant to, and 
subject to the terms of, the Registration Rights Agreement.  The Company 
hereby covenants to perform all such obligations under the Registration 
Rights Agreement for the benefit of such Holders.

                                   ARTICLE V.
                                          
                             SUCCESSOR CORPORATION

SECTION 5.1.   LIMITATION ON MERGER, SALE OR CONSOLIDATION.

          (a)  The Company shall not, directly or indirectly, consolidate 
with or merge with or into another Person or sell, lease, convey or transfer 
all or substantially all of its assets (other than to a wholly-owned 
Subsidiary or Subsidiaries), whether in a single transaction or a series of 
related transactions, to another Person or group of affiliated Persons, 
unless (i) either (a) in the case of a merger or consolidation, the Company 
is the surviving entity or (b) the resulting, surviving or transferee entity 
is a corporation organized under the laws of the United States (including any 
state thereof or the District of Columbia), Canada or any other country that 
is a member of the European Union; provided that with respect to any 
corporation organized under the laws of any European Union country other than 
the United Kingdom, 

                                      -34-
<PAGE>

such corporation must be listed on the New York Stock Exchange or the 
American Stock Exchange or quoted on the Nasdaq National Market, and 
expressly assumes by supplemental indenture all of the obligations of the 
Company in connection with the Securities and the Indenture; and (ii) no 
Default or Event of Default shall exist or shall occur immediately after 
giving effect to such transaction; and (iii) the Company has delivered to the 
Trustee an Officers' Certificate and an Opinion of Counsel, each stating that 
such consolidation, merger or transfer and, if a supplemental indenture is 
required, such supplemental indenture comply with this Indenture and that all 
conditions precedent relating to such transaction have been satisfied.

          (b)  For purposes of clause (a) of this Section 5.1 and Section 
12.6, the sale, lease, conveyance, assignment, transfer, or other disposition 
of all or substantially all of the properties and assets of one or more 
Subsidiaries of the Company, which properties and assets, if held by the 
Company instead of such Subsidiaries, would constitute all or substantially 
all of the properties and assets of the Company on a consolidated basis, 
shall be deemed to be the transfer of all or substantially all of the 
properties and assets of the Company.

SECTION 5.2.   SUCCESSOR CORPORATION SUBSTITUTED. 

          Upon any consolidation or merger or any sale, lease, conveyance or 
transfer of all or substantially all of the assets of the Company in 
accordance with the foregoing, the successor corporation formed by such 
consolidation or into which the Company is merged or to which such sale, 
lease, conveyance or transfer is made, shall succeed to, and be substituted 
for, and may exercise every right and power of, the Company under the 
Indenture with the same effect as if such successor corporation had been 
named therein as the Company, and when a successor corporation duly assumes 
all of the obligations of the Company pursuant hereto and pursuant to the 
Securities, the predecessor shall be released from such obligations (except 
with respect to any obligations that arise from or as a result of such 
transaction).

                                  ARTICLE VI.
                                          
                         EVENTS OF DEFAULT AND REMEDIES

SECTION 6.1.   EVENTS OF DEFAULT.  

          "Event of Default", wherever used herein, means any one of the 
following events (whatever the reason for such Event of Default and whether 
it shall be caused voluntarily or involuntarily or effected, without 
limitation, by operation of law or pursuant to any judgment, decree or order 
of any court or any order, rule or regulation of any administrative or 
governmental body):

          (1)  failure to pay any installment of interest on, or any 
     Liquidated Damages with respect to, the 

                                      -35-
<PAGE>

     Securities as and when the same becomes due and payable, whether or not 
     such payment is prohibited by Article XI, or to perform any conversion 
     of the Securities required under this Indenture, and the continuance of 
     such failure for a period of 30 days;

          (2)  failure to pay all or any part of the principal of, or 
     premium, if any on the Securities when and as the same become due and 
     payable at maturity, redemption, by acceleration or otherwise, 
     including, without limitation, failure to pay all or any part of the 
     Repurchase Price on the Repurchase Date in accordance with Article X, 
     whether or not such payment is prohibited by Article XI;

          (3)  failure by the Company to observe or perform any covenant or 
     agreement contained in the Securities or this Indenture (other than a 
     default in the performance of any covenant or agreement which is 
     specifically dealt with elsewhere in this Section 6.1), and continuance 
     of such failure for a period of 60 days after there has been given, by 
     registered or certified mail, to the Company by the Trustee, or to the 
     Company and the Trustee by Holders of at least 25% in aggregate 
     principal amount of the then outstanding Securities, a written notice 
     specifying such failure, requesting it to be remedied and stating that 
     such notice is a "Notice of Default" hereunder;

          (4)  failure by the Company or any Significant Subsidiary to pay at 
     final maturity (either at its stated maturity or upon acceleration 
     thereof) any Indebtedness of the Company or any Significant Subsidiary 
     in a principal amount then outstanding in excess of $10,000,000, and 
     such Indebtedness is not discharged, or such acceleration is not 
     rescinded or annulled within a period of 30 days after the giving of a 
     Notice of Default;

          (5)  a decree, judgment or order by a court of competent 
     jurisdiction shall have been entered adjudging the Company or any of its 
     Significant Subsidiaries as bankrupt or insolvent, or approving as 
     properly filed a petition seeking reorganization of the Company or any 
     of its Significant Subsidiaries under any Bankruptcy Law, and such 
     decree, judgment or order shall have continued undischarged and unstayed 
     for a period of 60 days; or a decree or order of a court of competent 
     jurisdiction over the appointment of a receiver, liquidator, trustee or 
     assignee in bankruptcy or insolvency of the Company, any of its 
     Significant Subsidiaries, or of the property of any such Person, or for 
     the winding up or liquidation of the affairs of any such Person, shall 
     have been entered, and such decree, judgment or order shall have 
     remained 

                                       -36-
<PAGE>

     in force undischarged and unstayed for a period of 60 days;

          (6)  the Company or any of its Significant Subsidiaries shall 
     institute proceedings to be adjudicated a voluntary bankrupt, or shall 
     consent to the filing of a bankruptcy proceeding against it, or shall 
     file a petition or answer of consent seeking reorganization under any 
     Bankruptcy Law, or shall consent to the filing of any such petition, or 
     shall consent to the appointment of a custodian, receiver, liquidator, 
     trustee or assignee in bankruptcy or insolvency of it or any of its 
     assets or property, or shall make a general assignment for the benefit 
     of creditors; or take any corporate action in furtherance of or to 
     facilitate, conditionally or otherwise, any of the foregoing; or

          (7)  final unsatisfied judgments not covered by insurance, 
     aggregating in excess of $10,000,000 at any one time shall have been 
     rendered against the Company or any of its Significant Subsidiaries and 
     not have been stayed, bonded or discharged for a period (during which 
     execution shall not be effectively stayed) of 60 days (or, in the case 
     of any such final judgment which provides for payment over time, which 
     shall so remain unstayed, unbonded or undischarged beyond any applicable 
     payment date provided therein).

Notwithstanding the 60-day period and notice requirement contained in Section 
6.1(3) above, with respect to a default under Article X the 60-day period 
referred to in Section 6.1(3) shall be deemed to have begun as of the date 
the Change of Control notice is required to be sent in the event that the 
Company has not complied with the provisions of Section 10.1 and the Trustee 
or Holders of at least 25% in principal amount of the outstanding Securities 
thereafter have given the Notice of Default referred to in Section 6.1(3) to 
the Company and, if applicable, the Trustee; provided, however, that if the 
breach or default is a result of a default in the payment when due of the 
Repurchase Price on the Repurchase Date, such Event of Default shall be 
deemed, for purposes of this Section 6.1, to arise no later than on the last 
Repurchase Date.  

          If a Default shall occur and be continuing and be known to the
Trustee, the Trustee shall, within 90 days after the occurrence of such Default,
give to the Holders notice of such Default; provided that the Trustee shall be
protected in withholding such notice if it in good faith determines that the
withholding of such notice is in the best interest of the Holders, except in the
case of a Default in the payment of any amounts due on the Securities
(including, without limitation, principal of, premium, if any, interest on, or
any Liquidated Damages, with respect to, any of the Securities when due, or in
the payment of Redemption Price or the Repurchase Price).

                                       -37-
<PAGE>

SECTION 6.2.  ACCELERATION OF MATURITY DATE; RESCISSION AND ANNULMENT.

          If an Event of Default (other than an Event of Default specified in 
Section 6.1(5) or (6) relating to the Company) occurs and is continuing, 
then, in every such case, unless the principal of all of the Securities shall 
have already become due and payable, either the Trustee or the Holders of not 
less than 25% in aggregate principal amount of then outstanding Securities, 
by a notice in writing to the Company (and to the Trustee if given by 
Holders) (an "Acceleration Notice"), may declare all of the principal of the 
Securities (or the Repurchase Price if the Event of Default includes failure 
to pay the Repurchase Price, determined as set forth below), including in 
each case accrued interest and any Liquidated Damages thereon, to be due and 
payable immediately. If an Event of Default specified in Section 6.1(5) or 
(6) relating to the Company occurs, all amounts due thereon will be 
immediately due and payable on all outstanding Securities without any 
declaration or other act on the part of Trustee or the Holders.

          At any time after such a declaration of acceleration has been made 
and before a judgment or decree for payment of the money due has been 
obtained by the Trustee as hereinafter provided in this Article VI, the 
Holders of not less than a majority in aggregate principal amount of then 
outstanding Securities, by written notice to the Company and the Trustee, may 
rescind, on behalf of all Holders, any such declaration of acceleration if:

          (1) the Company has paid or deposited with the Trustee Cash 
    sufficient to pay

               (A)  All overdue interest and Liquidated Damages on all
          Securities

               (B)  the principal, Redemption Price or Repurchase Price of any
          Securities which would then be due otherwise than by such declaration
          of acceleration, and interest thereon at the rate borne by the
          Securities

               (C)  to the extent that payment of such interest is lawful,
          interest upon overdue interest and overdue Liquidated Damages at the
          rate borne by the Securities       

               (D)  all sums paid or advanced by the Trustee hereunder and the
          compensation, expenses, disbursements and advances of the Trustee, its
          agent and counsel, and

          (2)  all Events of Default, other than the non-payment of the 
     principal, Redemption Price or Repurchase Price of, and interest and any 
     Liquidated 

                                       -38-
<PAGE>

     Damages on, the Securities that have become due solely by such 
     declaration of acceleration, have been cured or waived as provided in 
     Section 6.12, including, if applicable, any Event of Default relating to 
     the covenants contained in Section 10.1.

          Notwithstanding the previous sentence of this Section 6.2, no 
waiver shall be effective against any Holder for any Default or Event of 
Default with respect to any covenant or provision which cannot be modified or 
amended without the consent of the Holder of each outstanding Security 
affected thereby, unless all such affected Holders agree, in writing, to 
waive such Default or Event of Default.  No such waiver shall cure or waive 
any subsequent Default or Event of Default or impair any right consequent 
thereon.

SECTION 6.3.  COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT BY TRUSTEE.

          The Company covenants that if an Event of Default in payment of any 
amount specified in clause (1) or (2) of Section 6.1 occurs and is 
continuing, the Company shall, upon demand of the Trustee, pay to it, for the 
benefit of the Holders of such Securities, the whole amount then due and 
payable on such Securities and, to the extent that payment of such interest 
shall be legally enforceable, interest on any such overdue amounts, including 
any overdue interest and Liquidated Damages, at the rate borne by the 
Securities, and, in addition thereto, such further amount as shall be 
sufficient to cover the reasonable costs and expenses of collection, 
including compensation to, and reasonable expenses, disbursements and 
advances of the Trustee, its agents and counsel.

          If the Company fails to pay such amounts forthwith upon such 
demand, the Trustee, in its own name and as trustee of an express trust in 
favor of the Holders, may institute a judicial proceeding for the collection 
of the sums so due and unpaid, may prosecute such proceeding to judgment or 
final decree and may enforce the same against the Company or any other 
obligor upon the Securities and collect the moneys adjudged or decreed to be 
payable in the manner provided by law out of the property of the Company or 
any other obligor upon the Securities, wherever situated.

          If an Event of Default occurs and is continuing, the Trustee may in 
its discretion proceed to protect and enforce its rights and the rights of 
the Holders by such appropriate judicial proceedings as the Trustee shall 
deem most effective to protect and enforce any such rights, whether for the 
specific enforcement of any covenant or agreement in this Indenture or in aid 
of the exercise of any power granted herein, or to enforce any other proper 
remedy.

SECTION 6.4.  TRUSTEE MAY FILE PROOFS OF CLAIM.

          In case of the pendency of any receivership, insolvency, liquidation,
bankruptcy, reorganization, 

                                       -39-
<PAGE>

arrangement, adjustment, composition or other judicial proceeding relative to 
the Company or any other obligor upon the Securities or the property of the 
Company or of su