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                                                                  EXECUTION COPY

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                          FIRST SUPPLEMENTAL INDENTURE

                                      among

                               PECOM ENERGIA S.A.,
                                   as Issuer,

                              The Bank of New York,
                       as Trustee, Co-Security Registrar,
       Authenticating Agent, Paying Agent and Transfer Agent in New York,

                           Banco Rio de la Plata S.A.,
           as Security Registrar, Argentine Paying Agent and Transfer
                               Agent in Argentina,

                                 JPMorgan Chase,
                 as Administrative Agent and Calculation Agent,

                  Short Term Floating Rate Trade Series J Notes

                           Dated as of October 4, 2002

  (Supplemental to Amended and Restated Indenture, dated as of August 1, 2002)

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                                TABLE OF CONTENTS

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                                    ARTICLE 1

1.       RELATION TO INDENTURE; DEFINITIONS.......................................................................      2

         1.1      Relation to Indenture...........................................................................      2

         1.2      Definitions.....................................................................................      2

         1.3      Accounting Terms and Determinations.............................................................      3

                                    ARTICLE 2

2.       THE SHORT TERM TRADE SERIES NOTES........................................................................      3

         2.1      The Short Term Trade Series Notes...............................................................      3

         2.2      Forms of Short Term Trade Series Notes..........................................................      3

         2.3      Interest Rates..................................................................................      4

         2.4      Redemption......................................................................................      6

         2.5      General Provisions as to Payments..............................................................      12

         2.6      Computation of Interest........................................................................      13

         2.7      LIBOR Disruption...............................................................................      13

         2.8      Additional Amounts - Taxes.....................................................................      14

         2.9      Illegality.....................................................................................      15

         2.10     Yield Protection...............................................................................      15

         2.11     Increased Costs and Reduced Return.............................................................      15

         2.12     No Defeasance of Short Term Trade Series Notes.................................................      17

         2.13     Ranking of Short Term Trade Series Notes.......................................................      17

         2.14     Certain Rights While the Notes are in Global Form..............................................      18

         2.15     Special Transfer Provisions....................................................................      18
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                                    ARTICLE 3

3.       COVENANTS...............................................................................................      20

         3.1      Information....................................................................................      21

         3.2      Use of Proceeds................................................................................      21

         3.3      CNV Filing.....................................................................................      21

         3.4      Money for Security Payments to be Held in Trust................................................      21

         3.5      Currency of Payment............................................................................      21

                                    ARTICLE 4

4.       REPRESENTATIONS AND WARRANTIES..........................................................................      22

                                    ARTICLE 5

5.       DEFAULTS................................................................................................      22

         5.1      Events of Default..............................................................................      22

         5.2      Waiver of Past Defaults........................................................................      23

         5.3      Notice of Defaults.............................................................................      23

                                    ARTICLE 6

6.       THE SHORT TERM TRADE SERIES AGENTS AND THE TRUSTEE......................................................      24

         6.1      Appointment and Authorization..................................................................      24

         6.2      Agent and Affiliates...........................................................................      25

         6.3      Action by Short Term Trade Series Agents.......................................................      25

         6.4      Consultation; Additional Agents................................................................      25

         6.5      Liability of Short Term Trade Series Agents....................................................      26

         6.6      Successor Agent................................................................................      26

         6.7      Application of Money Collected.................................................................      27

         6.8      Removal of Trustee.............................................................................      28

         6.9      Indemnification................................................................................      28
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         6.10     Survival.......................................................................................      28

                                    ARTICLE 7

7.       SECURITYHOLDERS' LISTS AND COMPANY INFORMATION..........................................................      29

         7.1      Preservation of Information; Communications to Holders.........................................      29

                                    ARTICLE 8

8.       REDEMPTION OF SECURITIES................................................................................      29

         8.1      Selection of Short Term Trade Series Notes to be Redeemed......................................      29

         8.2      Purchase of Securities by the Issuer...........................................................      29

                                    ARTICLE 9

9.       MISCELLANEOUS...........................................................................................      29

         9.1      Incorporation of Indenture.....................................................................      29

         9.2      Notices........................................................................................      30

         9.3      No Waivers.....................................................................................      30

         9.4      Amendments and Waivers; Supplemental Indenture.................................................      30

         9.5      Judgment Currency..............................................................................      31

         9.6      Waiver of Jury Trial...........................................................................      31

         9.7      Submission to Jurisdiction; Service of Process; Waiver of Arraigo..............................      31

         9.8      Waiver of Sovereign Immunity...................................................................      32

         9.9      Knowledge of Trustee...........................................................................      32

         9.10     Modification of the Indenture..................................................................      33

         9.11     Governing Law..................................................................................      33

         9.12     Right of Set-Off...............................................................................      33

         9.13     Counterparts...................................................................................      33
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Exhibits

Exhibit A - Form of Short Term Trade Series Global Note

Exhibit B - Form of Short Term Trade Series Definitive Note

Exhibit C - Form of Certificate to Be Delivered in Connection with Transfers
Pursuant to Regulation S

Annexes

Annex A - Index of Defined Terms

Annex B - Representations and Warranties

Annex C - Covenants of the Issuer

Annex D - Events of Default

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                  First Supplemental Indenture (this "Short Term Trade Series
Supplemental Indenture") dated as of October 4, 2002 among (i) PECOM ENERGIA
S.A., a sociedad anonima organized under the laws of the Republic of Argentina
(the "Issuer"), (ii) The Bank of New York, as Trustee (together with its
successors in trust hereunder, the "Trustee"), Co-Security Registrar,
Authenticating Agent, Paying Agent (in such capacity, acting on behalf of any
one or more Short Term Trade Series Holders, together with its successors in
such capacity, the "Paying Agent") and Transfer Agent, (iii) Banco Rio de la
Plata S.A., as Security Registrar, Paying Agent in Argentina (in such capacity,
acting on behalf of any one or more Short Term Trade Series Holders, together
with its successors in such capacity, the "Argentine Paying Agent") and Transfer
Agent in Argentina, and (iv) JPMorgan Chase, as Administrative Agent (in such
capacity, acting on behalf of any one or more Short Term Trade Series Holders,
together with its successors in such capacity, the "New Notes Administrative
Agent") and Calculation Agent (in such capacity, acting on behalf of any one or
more Short Term Trade Series Holders, together with its successors in such
capacity, the "Calculation Agent").

                              W I T N E S S E T H:

                  WHEREAS, the Issuer and the Trustee have executed and
delivered an Amended and Restated Indenture dated as of August 1, 2002 (the
"Base Indenture," and as the same may be amended or supplemented from time to
time, including by this Short Term Trade Supplemental Indenture, the
"Indenture");

                  WHEREAS, Section 901 of the Base Indenture permits the Issuer
and the Trustee to enter into an indenture supplemental to the Base Indenture to
provide for the issuance of and to establish the form and terms and conditions
of any additional Series of Securities;

                  WHEREAS, Sections 201, 202 and 901 of the Base Indenture
permit the form of security of each additional Series of Securities to be
established pursuant to an indenture supplemental to the Base Indenture;

                  WHEREAS, Section 301 of the Base Indenture permits certain
terms of any additional Series of Securities to be established pursuant to an
indenture supplemental to the Base Indenture;

                  WHEREAS, pursuant to a resolution of the shareholders of the
Issuer adopted on April 8, 1998 and a resolution of the Board of Directors of
the Issuer adopted on April 17, 1998, the Issuer has established a Medium-Term
Note program for the issuance of Securities (and such program has been approved
by the CNV pursuant to certificate 202 dated May 4, 1998, and certificate of 290
dated July 3, 2002), in accordance with which the Issuer is authorized to issue
from time to time up to an aggregate principal amount outstanding at any time of
up to US$2,500,000,000 of Securities (including Short Term Trade Series Notes)
in one or more series;

                  WHEREAS, pursuant to resolutions of the Board of Directors of
the Issuer adopted on April 17, 1998 and September 18, 2002, the Issuer has
authorized the issue of the Short Term Trade Series Notes; and

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                  WHEREAS, all things necessary to make this Short Term Trade
Series Supplemental Indenture a valid agreement of the Issuer and the Trustee
and a valid amendment and supplement to the Base Indenture have been done;

NOW, THEREFORE, THIS SHORT TERM TRADE SERIES SUPPLEMENTAL INDENTURE WITNESSETH:

                  For and in consideration of the premises and the issuance of
the Short Term Trade Series Notes provided for herein, it is mutually covenanted
and agreed, for the equal and proportionate benefit of the Short Term Trade
Series Holders, as follows:

                                   ARTICLE 1

                  1.       RELATION TO INDENTURE; DEFINITIONS

                  1.1      RELATION TO INDENTURE

                  This Short Term Trade Series Supplemental Indenture
constitutes an integral part of the Indenture (the provisions of which, as
modified by this Short Term Trade Series Supplemental Indenture, shall only
apply to the Short Term Trade Series Notes) in respect of the Short Term Trade
Series Notes but shall not modify, amend or otherwise affect the Base Indenture
insofar as it relates to any other Series of Notes or affect in any manner the
terms and conditions of the Notes of any other Series.

                  1.2      DEFINITIONS

                  For all purposes of this Short Term Trade Series Supplemental
Indenture, the capitalized terms used herein (i) which are defined herein or in
the attached Annex A have the meanings assigned thereto herein or in the
attached Annex A, and (ii) which are not defined herein or in the attached Annex
A, have the meanings assigned thereto in the Base Indenture.

                  1.2.1    In this Short Term Trade Series Supplemental
Indenture, unless otherwise indicated and unless otherwise required by the
context, the singular includes the plural and plural the singular; words
importing any gender include each other gender; references to statutes or
regulations are to be construed as including all statutory or regulatory
provisions consolidating, amending or replacing the statute or regulation
referred to; references to "writing" include printing, typing, lithography and
other means of reproducing words in a tangible visible form; the words
"including", "includes" and "include" shall be deemed to be followed by the
words "without limitation"; the words "will" and "shall" shall be deemed to be
interchangeable; references to articles, sections (or subdivisions of sections),
an annex, an appendix or schedules are to this Short Term Trade Series
Supplemental Indenture; references to agreements and other contractual
instruments shall be deemed to include all subsequent amendments, extensions and
other modifications to those instruments (without, however, limiting any
prohibition on any such amendments, extensions and other modifications by the
terms of any Note Document); and references to Persons include their respective
permitted assigns and successors and, in the case of Governmental Authorities,
Persons succeeding to their respective functions and capacities. The division of
this Short Term Trade Series Supplemental Indenture into Articles and Sections
and

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the insertion of an index and headings are for convenience of reference only and
shall not affect the construction or interpretation of this Short Term Trade
Series Supplemental Indenture. The terms "this Short Term Trade Series
Supplemental Indenture", "herein", "hereof", "hereunder" and similar expressions
refer to this entire Short Term Trade Series Supplemental Indenture, including
any Annex, Appendix, Exhibit and Schedule hereto, and not to any particular
Article, Section, paragraph, Annex, Appendix, Exhibit, Schedule or other portion
hereof and include any agreement supplemental hereto. Reference to the "end of a
day" shall mean immediately prior to midnight on such day. Except as otherwise
expressly provided, Governmental Rules shall mean such Governmental Rules as the
same may from time to time be supplemented, amended, modified, restated or
replaced.

                  1.3      ACCOUNTING TERMS AND DETERMINATIONS

                  Unless otherwise specified herein, all accounting terms used
herein shall be interpreted, all accounting determinations hereunder shall be
made, and all financial statements required to be delivered hereunder shall be
prepared in accordance with Argentine GAAP, applied on a basis consistent
(except for changes concurred in by the Issuer's independent public accountants)
with the most recent audited consolidated financial statements of the Issuer and
its Subsidiaries delivered to the Short Term Trade Series Holders.

                                   ARTICLE 2

                  2.       THE SHORT TERM TRADE SERIES NOTES

                  2.1      THE SHORT TERM TRADE SERIES NOTES

                  2.1.1    Pursuant to Sections 201 and 301 of the Base
Indenture, the Issuer hereby creates a series of notes designated the "Short
Term Floating Rate Trade Series J Notes, due October 3, 2003" (the "Short Term
Trade Series Notes"). The Short Term Trade Series Notes shall be limited to
US$75,693,000 in aggregate principal amount and shall be issued on a single
date, which will be the date of the Takedown with respect to the Short Term
Trade Series Notes (except for Short Term Trade Series Notes authenticated and
delivered upon registration of transfer of, or in exchange for, or in lieu of,
other Short Term Trade Series Notes pursuant to Sections 304, 305, 306 and 307
of the Base Indenture). The Short Term Trade Series Notes shall be dated the
date of the Takedown with respect to the Short Term Trade Series Notes. The
principal of the Short Term Trade Series Notes shall be payable in full on the
Maturity Date.

                  2.2      FORMS OF SHORT TERM TRADE SERIES NOTES

                  2.2.1    The Short Term Trade Series Notes hereunder will be
issued at par, without coupons, in denominations of $1,000, substantially in the
form of Exhibit A hereto in the form of one or more DTC Restricted Global
Securities and Regulation S Global Securities, in accordance with Section 202 of
the Base Indenture. The Short Term Trade Series Notes shall be negotiable
obligations under the Negotiable Obligations Law.

                  2.2.2    At any time after the issuance of the Short Term
Trade Series Notes in the form of Global Securities, any Short Term Trade Series
Holder may, by written notice to the

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Trustee, request that all or part of its interest in a Global Security be
exchanged for one or more Definitive Securities, substantially in the form of
Exhibit B hereto, pursuant to Subsection 204(c)(iv) of the Base Indenture, and
the Issuer will execute and Trustee will authenticate such Definitive Securities
pursuant to Subsection 204(c)(v) of the Base Indenture. In addition, the Short
Term Trade Series Notes shall be issued in the form of Definitive Registered
Securities pursuant to the terms of Section 204(c)(i) in the Base Indenture.

                  2.3      INTEREST RATES

                  2.3.1    Each Short Term Trade Series Note shall bear interest
on the outstanding principal amount thereof, for each day, other than a day
during an Alternate Rate Period, during the applicable Interest Period, at a
rate per annum equal to the Applicable LIBOR Rate applicable to such Interest
Period as determined by the Calculation Agent in accordance with the provisions
of the Indenture (including the definition of "LIBOR" in this Short Term Trade
Series Supplemental Indenture) which determination shall be conclusive absent
manifest error. The interest accrued in respect of each Short Term Trade Series
Note pursuant to this Section 2.3 as of each Payment Date shall be payable on
such Payment Date.

                  2.3.2    Each Short Term Trade Series Note shall bear interest
on the outstanding principal amount thereof, for each day that falls in any
Alternate Rate Period during any Interest Period, at a rate per annum equal to
the Alternative Basis Interest Rate as determined by the Calculation Agent in
accordance with the provisions of the Indenture.

                  2.3.3    Any overdue amount of Note Payments with respect to
the Short Term Trade Series Notes shall (without duplication of any amounts
payable under clauses 2.3.1 or 2.3.2 of this Section 2.3) bear interest, payable
on demand (such interest, "Default Interest"), (i) for each day, other than a
day during an Alternate Rate Period, until (and to the extent) Satisfied in
Cash, at a rate per annum equal to the sum of the Applicable LIBOR Rate then in
effect plus 2% and (ii) on and after the Maturity Date until such amount shall
be Satisfied in Cash in full at a rate per annum equal at all times to the sum
of (A) the Applicable LIBOR Rate computed for the period determined by the New
Notes Administrative Agent beginning with the Maturity Date and for successive
one-month periods as though each were an Interest Period plus (B) 2%.

                  2.3.4    (a) The initial Interest Period shall commence on the
date of the Takedown and shall end as provided in the definition of Interest
Period. Thereafter, each Interest Period shall commence as provided in the
definition of Interest Period and end on a Payment Date, provided that the last
Interest Period shall end on the Maturity Date.

                  (b)      Prior to the commencement of any Interest Period, the
         Calculation Agent will notify the Issuer, the Trustee and the Short
         Term Trade Series Holders of (i) the Applicable LIBOR Rate or
         Alternative Basis Interest Rate for such Interest Period and (ii) the
         total aggregate amount of interest payable on the next Payment Date.

                  2.3.5    The Calculation Agent shall determine the interest
rate applicable in respect of each Interest Period for each day during an
Alternate Rate Period in accordance with the following provisions:

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                  (a)      upon delivery of an Alternate Rate Notice under
         Section 2.7(a), the alternative basis for computing interest (the
         "Alternative Basis Interest Rate"), which shall be payable in
         connection with such Interest Period shall be the greater of (x) the
         Federal Funds Rate plus 0.5% or (y) the Prime Rate, plus in each case
         the Applicable Margin; or

                  (b)      if the Alternate Rate Notice was delivered under
         Section 2.7(b), then during the 30 days next succeeding the giving of
         an Alternate Rate Notice, the Issuer and the Majority Holders shall
         negotiate in good faith in order to arrive at a mutually satisfactory
         alternative basis for computing interest (the "Alternative Basis
         Interest Rate"), which shall be payable in connection with such
         Interest Period in order to compensate the Short Term Trade Series
         Holders for the inadequate interest rate resulting from the occurrence
         of the conditions specified in Section 2.7(b). If within such 30-day
         period, the Issuer and the Majority Holders agree in writing upon the
         Alternative Basis Interest Rate, such Alternative Basis Interest Rate
         shall be payable to all Short Term Trade Series Holders in respect of
         their holdings of Short Term Trade Series Notes from the commencement
         of, and only for, the duration of such Interest Period. If the Issuer
         and the Majority Holders fail to agree upon such Alternative Basis
         Interest Rate within such 30-day period, the Alternative Basis Interest
         Rate in connection with such Interest Period payable to each Short Term
         Trade Series Holder for such Interest Period shall be such Alternative
         Basis Interest Rate as such Short Term Trade Series Holder shall
         determine (in a certificate delivered by such Short Term Trade Series
         Holder to the Trustee setting forth the basis of the computation of
         such amount, which certificate shall be conclusive and binding for all
         purposes, absent manifest error) to be necessary to compensate such
         Short Term Trade Series Holder for its cost of obtaining (in good faith
         and using commercially reasonable efforts to minimize the interest cost
         to the Issuer) as of the commencement of such Interest Period funds for
         such Interest Period in an amount equal to the principal amount of such
         Short Term Trade Series Holder's outstanding Short Term Trade Series
         Notes plus the Applicable Margin. The Trustee shall notify the Issuer
         and the Calculation Agent of each such determination as promptly as
         practicable.

                  As the negotiations described in the preceding subparagraph of
this Section 2.3.5 and any resulting Alternative Basis Interest Rate are
intended for the direct benefit of the Short Term Trade Series Holders, the
Issuer expressly covenants and acknowledges (i) that as a result of any such
negotiations following the delivery of an Alternate Rate Notice under Section
2.7(b), the Short Term Trade Series Holders shall not receive a lower rate of
interest on the Short Term Trade Series Notes than the Short Term Trade Series
Holders would have received had there not been such negotiations, and (ii) that
such negotiations shall in no event cause, justify or give rise to any delay or
reduction in the payment of interest, principal or other amounts payable by the
Issuer under the Indenture or the Short Term Trade Series Notes.

                  The Calculation Agent shall give prompt written notice to the
Issuer, the Trustee and the Short Term Trade Series Holders of the rate of
interest so determined, and its determination thereof shall be prima facie
evidence thereof, absent manifest error.

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                  2.4      REDEMPTION

                  2.4.1    OPTIONAL REDEMPTION

                  The Issuer may (a) upon at least three (3) Eurodollar Business
Days' irrevocable notice to the New Notes Administrative Agent, the Calculation
Agent and the Paying Agent, repay the Short Term Trade Series Notes outstanding
on the last day of any Interest Period, in whole or in part, at a redemption
price of 100% of the principal amount thereof plus accrued and unpaid interest
thereon to the date of redemption plus all other accrued and unpaid amounts
under the Note Documents in respect of such Short Term Trade Series Notes, if
any, (b) at any time upon at least three (3) Eurodollar Business Days'
irrevocable notice redeem the Short Term Trade Series Notes in whole, or in
part, at a redemption price of 100% of the principal amount thereof plus accrued
and unpaid interest thereon to the date of redemption plus LIBOR Funding Costs,
if any, plus all other accrued and unpaid amounts under the Note Documents in
respect of such Short Term Trade Series Notes (including without limitation, any
Additional Amounts), if any, and (c) redeem the Short Term Trade Series Notes at
any time if required so to do in order to comply with applicable law or if the
Issuer would be required to pay any Additional Amounts, at a redemption price of
100% of the principal amount thereof plus accrued and unpaid interest thereon to
the date of redemption plus LIBOR Funding Costs, if any, plus all other accrued
and unpaid amounts under the Note Documents in respect of such Short Term Trade
Series Notes (including, without limitation, any Additional Amounts), if any;
provided that each partial prepayment shall be in respect of an aggregate
principal amount of US$100,000 or an integral multiple of US$1,000 in excess
thereof and shall be made pro rata among all Short Term Trade Series Holders in
accordance with the respective amounts owing to them. Each such prepayment
hereunder shall be applied ratably to prepay the remaining scheduled principal
payments under the Short Term Trade Series Notes in accordance with the
respective amounts thereof.

                  2.4.2    MANDATORY REDEMPTION

                  2.4.2.1  The Issuer shall, on the first Payment Date that
occurs at least 120 days after the end of the fiscal year in which the Short
Term Trade Series Notes were issued, prepay an aggregate principal amount of the
Short Term Trade Series Notes in an amount equal to (a) 50% of the amount of
Excess Cash for such fiscal year multiplied by (b) a fraction, (i) the numerator
of which is equal to the aggregate outstanding principal amount of Short Term
Trade Series Notes immediately prior to such prepayment and (ii) the denominator
of which is the sum of:

                     (A)   the aggregate principal amount of all Letter of
                  Credit Advances outstanding under all Letter of Credit
                  Facilities and all New Notes in each case outstanding
                  immediately prior to any prepayment thereof from such Excess
                  Cash on such date, plus

                     (B)   the aggregate Available Amount of all Letters of
                  Credit outstanding under all Letter of Credit Facilities
                  immediately prior to any reduction thereof in respect of such
                  Excess Cash on such date, minus

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                     (C)      the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such Excess Cash
                  on such date.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments (not including the Payment Date on which
such payment is made) under the Short Term Trade Series Notes.

                  2.4.2.2  The Issuer shall, on the first Payment Date occurring
at least 180 days after the date of any Asset Sale by the Issuer or any of its
Subsidiaries (excluding Asset Sales in the ordinary course of business), prepay
an aggregate principal amount of the Short Term Trade Series Notes in an amount
equal to (a) 100% of the Net Cash Proceeds from such Asset Sale less the sum of
the proceeds of such Asset Sale that shall have been used for Capital
Expenditures prior to such Payment Date as permitted by subsection (e) of the
Negative Covenants in Annex C and, if such Asset Sale consists of a Sale of
Ecuadorian Assets, the amount of Net Cash Proceeds of such Asset Sale required
to be applied in accordance with Section 2.04(j) of the Letter of Credit
Issuance and Reimbursement Agreement multiplied by (b) a fraction, (i) the
numerator of which is equal to the aggregate outstanding principal amount of
Short Term Trade Series Notes immediately prior to such prepayment and (ii) the
denominator of which is the sum of:

                     (A)      the aggregate principal amount of all Letter of
                  Credit Advances outstanding under all Letter of Credit
                  Facilities and all New Notes in each case outstanding
                  immediately prior to any prepayment thereof from such Net Cash
                  Proceeds on such date, plus

                     (B)      the aggregate Available Amount of all Letters of
                  Credit outstanding under all Letter of Credit Facilities
                  immediately prior to any reduction thereof in respect of such
                  Net Cash Proceeds on such date, minus

                     (C)      the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such Net Cash
                  Proceeds on such date.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments (not including the Payment Date on which
such payment is made) under the Short Term Trade Series Notes.

                  2.4.2.3  On any date on which the Issuer shall, at its option,
prepay, redeem, repurchase or in any manner defease or discharge any outstanding
principal amount of any Long Term New Notes or Long Term Debt prior to the
scheduled maturity thereof the Issuer shall prepay an aggregate principal amount
of the Short Term Trade Series Notes equal to the product of:

                  (a)      the aggregate principal amount of the Short Term
Trade Series Notes outstanding at such time, multiplied by

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                  (b)      a fraction of which:

                           (i)      the numerator is equal to the aggregate
                  principal amount of such Long Term New Notes or Long Term
                  Debt, as applicable, that is the subject of such prepayment or
                  discharge (in each case immediately prior thereto), and

                           (ii)     the denominator is equal to the aggregate
                  principal amount of such Long Term New Notes or such Long Term
                  Debt outstanding immediately prior to such prepayment or
                  discharge.

In the event that the Issuer shall, at any time, with respect to any Long Term
New Notes or Long Term Debt, enter into any amendment to, or in any other manner
cause any change or rescheduling of, the scheduled payments of principal with
respect to such Debt that would result in a shortening of the remaining average
life of any such Debt, any payment of principal of such Debt on any date shall
be treated as an optional prepayment of such Debt for purposes of this Section
2.4.2.3.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes.

                  2.4.2.4  Whenever the Issuer shall on any date make an
optional prepayment or redemption of any outstanding Long Term Letter of Credit
Advances under a Letter of Credit Facility prior to the scheduled maturity
thereof then the Issuer shall on the date of such prepayment or redemption,
prepay an aggregate principal amount of the Short Term Trade Series Notes equal
to the product of the aggregate principal amount of the Short Term Trade Series
Notes outstanding on such date, multiplied by a fraction:

                  (a)      the numerator of which is equal to the aggregate
         principal amount of such Long Term Letter of Credit Advances prepaid
         and

                  (b)      the denominator of which is equal to:

                           (i)      the aggregate principal amount of all Long
                  Term Letter of Credit Advances under such Letter of Credit
                  Facility and all Long Term MT Notes issued upon any Conversion
                  of Long Term Letter of Credit Advances made under such Letter
                  of Credit Facility outstanding immediately prior to such
                  prepayment and redemption, plus

                           (ii)     the aggregate Available Amounts of all
                  Letters of Credit issued under such Letter of Credit Facility
                  outstanding immediately prior to such prepayment and
                  redemption, minus

                           (iii)    the aggregate amount of cash and investments
                  thereof credited to the L/C Cash Collateral Account in respect
                  of such Letter of Credit Facility outstanding immediately
                  prior to such prepayment and redemption.

In the event that the Issuer shall, at any time, with respect to any Long Term
Letter of Credit Advances, enter into any amendment to, or in any manner cause
any change or rescheduling of,

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the scheduled payments of principal with respect to such Debt that would result
in a shortening of the remaining average life of any such Debt, any payment of
principal of such Debt on any date shall be treated as an optional prepayment of
such Debt for purposes of this Section 2.4.2.4.

Each such prepayment shall be applied ratably to prepay the remaining scheduled
principal payments under the Short Term Trade Series Notes.

                  2.4.2.5  The Issuer shall, on the first Business Day that
occurs at least 50 days after the end of each fiscal quarter of the Issuer,
prepay the aggregate outstanding principal amount of the Short Term Trade Series
Notes in an amount equal to 50% of the New Debt Amount with respect to such
fiscal quarter multiplied by a fraction:

                  (a)      the numerator of which is equal to the aggregate
         principal amount of the Short Term Trade Series Notes outstanding
         immediately prior to any prepayment pursuant to this subsection, and

                  (b)      the denominator of which is equal to

                           (i)      the aggregate principal amount of the New
                  Notes, outstanding immediately prior to any prepayment thereof
                  in respect of such New Debt Amount, plus

                           (ii)     the aggregate principal amount of all Letter
                  of Credit Advances outstanding under all Letter of Credit
                  Facilities immediately prior to any prepayment thereof in
                  respect of such New Debt Amount, plus

                           (iii)    the aggregate Available Amount of all
                  Letters of Credit outstanding under all Letter of Credit
                  Facilities immediately prior to any reduction thereof in
                  respect of such New Debt Amount, minus

                           (iv)     the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such New Debt
                  Amount.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes.

                  2.4.2.6  On any date on which the Issuer shall at its option
make any deposit to any L/C Collateral Account pledged in favor of the Lenders
under any Letter of Credit Facility, at a time when no such deposit would
otherwise be required pursuant to the Letter of Credit Issuance and
Reimbursement Agreement, the Issuer shall, on the date of such deposit, prepay
an aggregate principal amount of the Short Term Trade Series Notes in an amount
equal to (a) the aggregate principal amount of the Short Term Trade Series Notes
outstanding on such date, multiplied by (b) a fraction:

                                       9

<PAGE>

                  (A)      the numerator of which is equal to the aggregate
         amount of cash so deposited into such L/C Cash Collateral Account in
         respect of such Letter of Credit Facility on such date, and

                  (B)      the denominator of which is equal to:

                           (I)      the aggregate principal amount of all Letter
                                    of Credit Advances outstanding under such
                                    Letter of Credit Facilities and New Notes
                                    issued upon any Conversion of Letter of
                                    Credit Advances made under such Letter of
                                    Credit Facility outstanding immediately
                                    prior to such deposit, plus

                           (II)     the aggregate Available Amount of all
                                    Letters of Credit outstanding under such
                                    Letter of Credit Facility immediately prior
                                    to such deposit, minus

                           (III)    the aggregate amount of cash and investments
                                    thereof credited to such L/C Collateral
                                    Account immediately prior to such deposit.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes
in accordance with the respective amounts thereof.

                  2.4.2.7  On any date on which the Issuer shall at its option
reduce the Available Amount of any Letter of Credit issued under any Letter of
Credit Facility by either (a) causing a new letter of credit for which the
Issuer or one or more of its Subsidiaries is the account party to be issued
other than under the Letter of Credit Issuance and Reimbursement Agreement or
(b) having the Issuer or one or more of its Subsidiaries create, assume, incur
or suffer to exist a Lien on cash or financial assets for the benefit of, or
contribute cash or financial assets to, the beneficiary thereof, at a time when
no such reduction would otherwise be required pursuant to the Letter of Credit
Issuance and Reimbursement Agreement, the Issuer shall prepay an aggregate
principal amount of the Short Term Trade Series Notes in an amount equal to (i)
the aggregate principal amount of the Short Term Trade Series Notes outstanding
at such date, multiplied by (ii) a fraction:

                  (A)      the numerator of which is equal to the aggregate
         reductions of such Available Amounts in respect of such Letter of
         Credit issued under such Letter of Credit Facility, and

                  (B)      the denominator of which is equal to:

                           (I)      the aggregate principal amount of all Letter
                                    of Credit Advances outstanding under such
                                    Letter of Credit Facility and the New Notes
                                    issued upon any Conversion of Letter of
                                    Credit Advances made under such Letter of
                                    Credit Facility, in each case outstanding
                                    immediately prior to such reduction, plus

                                       10

<PAGE>

                           (II)     the aggregate Available Amount of all
                                    Letters of Credit outstanding under such
                                    Letter of Credit Facility immediately prior
                                    to such reduction, minus

                           (III)    the aggregate amount of cash and investments
                                    thereof credited to the L/C Collateral
                                    Account in respect of such Letter of Credit
                                    Facility outstanding immediately prior to
                                    such reduction.

Each such prepayment shall be applied ratably to prepay the remaining scheduled
principal payments under the Short Term Trade Series Notes in accordance with
the respective amounts thereof.

                  2.4.2.8  The Issuer shall not on any date prior to the
Maturity Date thereof prepay, repurchase or in any manner defease or discharge
any principal amount of any Short Term Letter of Credit Advance, Short Term MT
Note or Short Term New Note (the "Prepaid Debt") unless otherwise required under
Section 2.04 of the Letter of Credit Issuance and Reimbursement Agreement or
under Section 2.4.2 of any Supplemental Indenture pursuant to which Short Term
New Notes are issued, or unless on the same date it shall have:

                  (A)      in the case of Short Term New Notes (other than Short
         Term MT Notes), other than any of the same constituting Prepaid Debt
         ("Other Short Term New Notes"), prepaid a principal amount thereof, and

                  (B)      in the case of Short Term L/C Facilities, other than
         any thereof in respect of the Prepaid Debt ( "Other Short Term L/C
         Facilities"), at its option:

                           (I)      prepaid the principal amount of Short Term
                  Letter of Credit Advances and Short Term MT Notes in respect
                  of such Letter of Credit Facilities,

                           (II)     reduced the Available Amount of Letters of
                  Credit issued under such Short Term L/C Facilities and/or

                           (III)    deposited cash into L/C Collateral Accounts
                  in respect of such Short Term L/C Facilities,

so that the aggregate amount of such prepayments and, if applicable, reductions
and deposits, as a percentage of:

                  (a)      in the case of each other series of Other Short Term
         New Notes, the aggregate principal amount of such series of Other Short
         Term New Notes then outstanding, and

                  (b)      in the case of each Other Short Term L/C Facilities,
         the total Available Amount of Letters of Credit issued and principal
         amount of Letter of Credit Advances and Short Term MT Notes outstanding
         in respect of such Other Short Term L/C Facility, minus the value of
         cash and investments on deposit in the L/C Collateral Account in
         respect of such Other Short Term L/C Facility,

                                       11

<PAGE>

is the same as the percentage of the prepaid principal amount of Prepaid Debt is
of

                  (i)      if such Prepaid Debt is Short Term New Notes, the
         principal amount of such series of Short Term New Notes then
         outstanding,

                  (ii)     if such Prepaid Debt is in respect of a Short Term
         L/C Facility, the total Available Amount of all Letters of Credit
         issued and the aggregate principal amount of Letter of Credit Advances
         and MT Notes in respect of such Short Term L/C Facility, minus the
         value of cash and investments on deposit in the L/C Collateral Account
         in respect of the Short Term L/C Facility.

In the event that the Issuer shall, at any time, with respect to any Short Term
Letter of Credit Advances, Short Term MT Notes or Short Term New Notes, enter
into any amendment to, or in any other manner cause any change or rescheduling
of, the scheduled payments of principal with respect to such Debt that would
result in a shortening of the remaining average life of any such Debt, any
payment of principal of such Debt on any date shall be treated as an optional
prepayment of such Debt for purposes of this Section 2.4.2.8.

Each prepayment under this Section 2.4.2 shall be made pro rata among all Short
Term Trade Series Holders in accordance with the respective amounts owing to
them. All prepayments under this Section 2.4.2 shall be made together with
accrued interest to the date of such prepayment on the principal amount prepaid
and any Additional Amounts, LIBOR Funding Costs or other amounts due hereunder.

                  2.5      GENERAL PROVISIONS AS TO PAYMENTS

                  2.5.1    The Issuer shall make each payment of principal of,
and interest on, the Short Term Trade Series Notes and of fees and other amounts
payable hereunder, not later than 3:00 p.m. (New York City time) on the date
when due, in immediately available funds in Dollars in New York City, to the
Paying Agent at its address referred to in Section 9.2. The Paying Agent will
promptly distribute to each Short Term Trade Series Holder its ratable share of
each such payment received by the Paying Agent for the account of the Short Term
Trade Series Holders. Whenever any payment of principal of, or interest on, the
Short Term Trade Series Notes shall be due on a day which is not a Eurodollar
Business Day, the date for payment thereof shall be extended to the immediately
succeeding Eurodollar Business Day unless such Eurodollar Business Day falls in
another calendar month, in which case the date for payment thereof shall be the
immediately preceding Eurodollar Business Day. If the date for any payment of
principal is extended by operation of law or otherwise, interest thereon shall
be payable for such extended time.

                  2.5.2    Notwithstanding the provisions of Section 2.5.1, upon
written notice to the Issuer and the Trustee by any Short Term Trade Series Note
Holder that a payment to it by the Issuer hereunder be made in Argentina, such
payment shall be made for the benefit of such Short Term Trade Series Note
Holder to the Argentine Paying Agent, in which event the provisions of

                                       12

<PAGE>

Section 2.5.1 relating to the Paying Agent shall apply mutatis mutandi to the
Argentine Paying Agent.

                  2.5.3    The Bank of New York shall be the initial Paying
Agent, and Banco Rio de la Plata S.A. shall be the initial Argentine Paying
Agent, for the Short Term Trade Series Notes. The consent of the Majority
Holders and the Issuer shall be required for the appointment of any successor in
such capacities in respect of the Short Term Trade Series Notes.

                  2.5.4    It is understood and agreed by the parties hereto
that, for all purposes of this Short Term Trade Series Supplemental Indenture
and the other Note Documents, the Issuer may satisfy its payment obligations
with respect to each of the Short Term Trade Series Notes by making payments in
Cash to the Paying Agent or, if applicable pursuant to Section 2.5.2, the
Argentine Paying Agent, for the benefit of the party to whom any such payment is
due and for the application thereof pursuant to the terms of the Indenture, and
the Issuer's payment obligations hereunder with respect to the Short Term Trade
Series Notes (i) may only be Satisfied in Cash, and (ii) shall be deemed
satisfied and discharged only and to the extent Satisfied in Cash.

                  2.6      COMPUTATION OF INTEREST

                  All interest hereunder shall be computed on the basis of a
year of 360 days and paid for the actual number of days elapsed (including the
first day but excluding the last day). Notwithstanding the foregoing, during
each Alternate Rate Period, for each day that the Alternative Basis Interest
Rate is determined by reference to the rate applicable pursuant to Section
2.3.5(a) and the Alternative Basis Interest Rate is based upon the Prime Rate as
contemplated therein, interest shall be computed on the basis of a year of 365
or 366 days, as the case may be, and paid for the actual number of days elapsed
(including the first day but excluding the last day). The applicable interest
rate for any Interest Period or Alternate Rate Period will be calculated by the
Calculation Agent in accordance with the provisions hereof and will be reported
to the Trustee, the Paying Agent and the Argentine Paying Agent, as an amount of
Dollars payable per U.S.$1,000 principal amount of Short Term Trade Series Notes
at least 3 days prior to the applicable Payment Date.

                  2.7      LIBOR DISRUPTION

                  If (a) on or prior to the first day of any Interest Period the
Calculation Agent reasonably determines (which determination shall be conclusive
absent manifest error) that adequate and reasonable means do not exist for
ascertaining the LIBOR for such Interest Period, or (b) on or prior to the first
day of any Interest Period the Majority Holders advise the Calculation Agent
that the LIBOR for such Interest Period will not adequately and fairly reflect
the cost to such Short Term Trade Series Holders of purchasing and holding their
Short Term Trade Series Notes during such Interest Period, the Calculation Agent
shall forthwith give notice thereof (an "Alternate Rate Notice") in respect of
such Interest Period to the Issuer, the Trustee and the Short Term Trade Series
Holders, whereupon until the Calculation Agent gives notice (an "Alternate Rate
Rescission Notice") to the Issuer, the Trustee and the Short Term Trade Series
Holders that each circumstance giving rise to such Alternate Rate Notice no
longer exists (it being understood that the Calculation Agent will give such
notice reasonably promptly after it

                                       13

<PAGE>

has knowledge that such circumstances have ceased to exist), the interest rate
applicable to the Short Term Trade Series Notes shall be determined pursuant to
Section 2.3.5.

                  2.8      ADDITIONAL AMOUNTS - TAXES

                  (a)      In addition to the provisions of the Base Indenture,
and, to the extent in conflict herewith, notwithstanding such provisions, the
Issuer agrees that any and all payments by the Issuer hereunder shall be made
free and clear of, and without withholding or deduction for or on account of,
any Taxes, excluding, (i) in the case of each Short Term Trade Series Holder,
New Notes Administrative Agent, Paying Agent or Argentine Paying Agent, Taxes
that are imposed on its overall net income (and franchise taxes imposed in lieu
thereof) by any state or foreign jurisdiction under the laws of which such Short
Term Trade Series Holder, New Notes Administrative Agent, Paying Agent or
Argentine Paying Agent, as the case may be, is organized, or any political
subdivision thereof, and (ii) in the case of each Short Term Trade Series
Holder, Taxes that are imposed on its overall net income (and franchise taxes
imposed in lieu thereof) by the state or foreign jurisdiction of its Holding
Office or any political subdivision thereof (all such nonexcluded Taxes in
respect of payments hereunder collectively, "Indemnifiable Taxes"). If any
Indemnifiable Taxes are required to be withheld or deducted from any such
payment, the Issuer shall pay such additional amounts as may be necessary to
ensure that the amounts received by each Short Term Trade Series Holder, New
Notes Administrative Agent, Paying Agent or Argentine Paying Agent (as the case
may be) after such withholding or deduction (and after withholding or deduction
on amounts payable under this Section 2.8) shall equal the respective amounts
that would have been receivable from the Issuer (any such additional amounts
required to be paid by the Issuer, "Additional Amounts").

                  (b)      The Issuer shall promptly pay when due any present or
future stamp, court or documentary taxes or any other excise or property taxes,
charges or similar levies (including the Personal Property Tax) that arise in
any jurisdiction from any payment made hereunder or from the execution,
delivery, enforcement or registration of this Agreement or any other document or
instrument referred to herein or therein (collectively, "Other Taxes").

                  (c)      The Issuer agrees to indemnify each Short Term Trade
Series Holder, New Notes Administrative Agent, Paying Agent or Argentine Paying
Agent for the full amount of Indemnifiable Taxes and Other Taxes, and for the
full amount of taxes of any kind imposed or asserted by any jurisdiction on
amounts payable under this Section 2.8, imposed on or paid by any such Short
Term Trade Series Holder, the New Notes Administrative Agent, the Paying Agent
or Argentine Paying Agent, as the case may be, and any liability (including
penalties, additions to tax interest and expenses) arising therefrom or with
respect thereto. Amounts payable by the Issuer under the indemnity set forth in
this subsection (c) shall be paid within 30 days from the date on which the
applicable Short Term Trade Series Holder, New Notes Administrative Agent,
Paying Agent or Argentine Paying Agent, as the case may be, makes written demand
therefor.

                  (d)      Within 30 days after the date of any payment of Taxes
under this Section 2.8, the Issuer will notify the Administrative Agent of such
payment and, at the request of the Administrative Agent, furnish to the
Administrative Agent at its address referred to in Section 9.2, the original or
a certified copy of a receipt evidencing payment thereof. Upon request, the

                                       14

<PAGE>

Issuer shall provide the Administrative Agent with documentation reasonably
satisfactory to the Administrative Agent evidencing the payment of any
Additional Amounts. Copies of such documentation shall be made available by the
Administrative Agent to the Short Term Trade Series Holders upon request.

                  2.9      ILLEGALITY

                  Notwithstanding any other provision of this Short Term Trade
Series Supplemental Indenture, if any Short Term Trade Series Holder shall
notify the Short Term Trade Series Administrative Agent that the introduction of
or any change in or in the interpretation of a law or regulation makes it
unlawful, or any central bank or other Governmental Authority asserts that it is
unlawful, for such Short Term Trade Series Holder or its Holding Office to
purchase, own, hold or maintain its Short Term Trade Series Note (after such
Short Term Trade Series Holder used such reasonable efforts to transfer its
Short Term Trade Series Notes if such transfer will avoid illegality and shall
not, in the sole judgment of such Short Term Trade Series Holder, be
disadvantageous (economically or otherwise) to such Short Term Trade Series
Holder) the Issuer shall promptly redeem the Short Term Trade Series Note(s)
held by such Short Term Trade Series Holder by paying the principal amount to be
redeemed, together with accrued interest thereon to the date of redemption,
together with any amounts payable pursuant to Section 2.10 in respect of such
redemption.

                  2.10     YIELD PROTECTION

                  If, for any reason, the Issuer makes any payment of principal
with respect to any Short Term Trade Series Note on any day other than the last
day of the Interest Period then applicable thereto, the Issuer shall, promptly
upon demand, reimburse each Short Term Trade Series Holder for any LIBOR Funding
Costs incurred by such Short Term Trade Series Holder of such amount prepaid,
provided that such Short Term Trade Series Holder shall have delivered to the
Issuer a certificate as to the amount of such loss or expense, which certificate
shall be conclusive and binding for all purposes, absent manifest error.

                  2.11     INCREASED COSTS AND REDUCED RETURN

                  2.11.1   If, on or after the date hereof, the adoption of any
applicable law, rule or regulation, or any change in any applicable law, rule or
regulation, or any change in the interpretation or administration thereof by any
Governmental Authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by any Short Term Trade
Series Holder (or its Holding Office) with any request or directive (whether or
not having the force of law) of any such authority, central bank or comparable
agency, (i) shall subject any Short Term Trade Series Holder (or its Holding
Office) to any tax, duty or other charge with respect to one or more of its
Short Term Trade Series Notes, or shall change the basis of taxation of payments
to any Short Term Trade Series Holder (or its Holding Office) of the principal
of or interest on its Short Term Trade Series Notes or any other amounts due
under this Indenture or any Short Term Trade Series Notes, except for the
introduction of, or changes in the rate of, tax on the overall net income of
such Short Term Trade Series Holder (or its Holding Office), or franchise taxes,
imposed by the jurisdiction (or any political subdivision or taxing authority
thereof) under the laws of which such Short Term Trade Series Holder is

                                       15

<PAGE>

organized (or in which such Short Term Trade Series Holder's Holding Office is
located); or (ii) shall impose, modify or deem applicable any reserve
(including, without limitation, any such requirement imposed by the Board of
Governors of the Federal Reserve System and minimum reserve requirements of the
European Central Bank but excluding any such requirement included in an
applicable Eurodollar Reserve Percentage), special deposit, insurance assessment
or similar requirement against assets of, deposits with or for the account of,
or credit extended by, any Short Term Trade Series Holder (or its Holding
Office) or shall impose on any Short Term Trade Series Holder (or its Holding
Office) or the London interbank market any other condition affecting the
purchasing, owning, holding or maintaining of any one or more Short Term Trade
Series Notes by such Short Term Trade Series Holder (or its Holding Office) and
the result of any of the foregoing is to increase the cost to such Short Term
Trade Series Holder (or its Holding Office) or any holding company of which such
Short Term Trade Series Holder is a subsidiary) of purchasing, owning, holding
or maintaining any one or more of its Short Term Trade Series Notes, or to
reduce the amount of any sum received or receivable by such Short Term Trade
Series Holder (or its Holding Office) under the Indenture and any one or more of
its Short Term Trade Series Notes, by an amount deemed by such Short Term Trade
Series Holder to be material (excluding, for purposes of this Section 2.11.1 any
increased costs or any reductions resulting from any Indemnifiable Taxes or
Other Taxes payable by the Issuer pursuant to Section 2.8), then, promptly upon
demand by such Short Term Trade Series Holder (with a copy to the New Notes
Administrative Agent and the Calculation Agent), which demand shall be
accompanied by a certificate of such Short Term Trade Series Holder setting
forth in reasonable detail the circumstances which give rise to such increase or
reduction, the amount of the claim and the calculation thereof (and which
certificate shall be conclusive and binding for all purposes, absent manifest
error), the Issuer shall, to the extent that it shall not have done so under any
other provision of the Indenture, pay to such Short Term Trade Series Holder
such additional amount or amounts as will, without duplication, compensate such
Short Term Trade Series Holder (or any holding company of which such Short Term
Trade Series Holder is a subsidiary) for such increased cost or reduction.

                  2.11.2   If, on or after the date hereof, any Short Term Trade
Series Holder shall determine that the adoption of any applicable law, rule or
regulation regarding capital adequacy, or any change in any such law, rule or
regulation, or any change in the interpretation or administration thereof by any
Governmental Authority, central bank or comparable agency charged with the
interpretation or administration thereof, or any request or directive regarding
capital adequacy (whether or not having the force of law) of any such authority,
central bank or comparable agency, has the effect of reducing the rate of return
on capital of any Short Term Trade Series Holder (or any holding company of
which such Short Term Trade Series Holder is a subsidiary) as a consequence of
such Short Term Trade Series Holder's purchasing, owning, maintaining or holding
any Short Term Trade Series Notes to a level below that which such Short Term
Trade Series Holder (or any holding company of which such Short Term Trade
Series Holder is a subsidiary) could have achieved but for such adoption,
change, request or directive (taking into consideration its policies with
respect to capital adequacy) by an amount deemed by such Short Term Trade Series
Holder to be material, then from time to time, promptly upon demand by such
Short Term Trade Series Holder (with a copy to the New Notes Administrative
Agent), which demand shall be accompanied by a certificate of such Short Term
Trade Series Holder setting forth in reasonable detail the circumstances which
give rise to such

                                       16

<PAGE>

reduction, the amount of the claim and the calculation thereof (and which
certificate shall be conclusive and binding for all purposes, absent manifest
error), the Issuer shall, to the extent that it shall not have already done so
under any other provision of the Indenture, pay to such Short Term Trade Series
Holder such additional amount or amounts as will, without duplication,
compensate such Short Term Trade Series Holder (or any holding company of which
such Short Term Trade Series Holder is a subsidiary) for such reduction.

                  2.11.3   Each Short Term Trade Series Holder will promptly
notify the Issuer, the New Notes Administrative Agent and the Calculation Agent
of any event of which it has knowledge, occurring after the date hereof, which
will entitle such Short Term Trade Series Holder to compensation pursuant to
this Section 2.11. Each Short Term Trade Series Holder will, before requesting
compensation for additional amounts pursuant to this Section 2.11, use
reasonable efforts (consistent with its internal policy and legal and regulatory
restrictions) to minimize or eliminate the requirement of such compensation by
transferring its Short Term Trade Series Notes to a different Holding Office or
otherwise if such transfer or other action will avoid or reduce the need for
compensation for such additional amounts and will not, in the sole judgment of
such Short Term Trade Series Holder, be otherwise disadvantageous (economically
or otherwise) to such Short Term Trade Series Holder; provided that no Short
Term Trade Series Holder shall have any obligation to provide any information as
to any possible actions or designations considered and taken or rejected by such
Short Term Trade Series Holder or the reasons therefor. A certificate of any
Short Term Trade Series Holder claiming compensation under this Section 2.11 and
setting forth the additional amount or amounts to be paid to it hereunder shall
be conclusive and binding for all purposes, absent manifest error.

                  2.11.4   The Issuer shall not be required to compensate a
Short Term Trade Series Holder as provided by this Section 2.11 if the increased
cost or reduction in respect of which such claim for additional amounts arises
results solely from a requirement which is applicable to the relevant Short Term
Trade Series Holder by reason of its financial condition or assets and which is
not of general application to similar persons of a similar type in similar
circumstances in the same jurisdiction.

                  2.12     NO DEFEASANCE OF SHORT TERM TRADE SERIES NOTES

                  Notwithstanding anything to the contrary in Article Twelve of
the Base Indenture, no total or partial or covenant defeasance of the Short Term
Trade Series Notes is permitted.

                  2.13     RANKING OF SHORT TERM TRADE SERIES NOTES

                  The Short Term Trade Series Notes will be unsecured and
unsubordinated obligations of the Issuer and will rank pari passu with no
preference among themselves. Payment obligations of the Issuer under the Short
Term Trade Series Notes, except as is or may be provided under Argentine law,
will rank at least pari passu in right of payment with all other present or
future unsecured and unsubordinated obligations of the Issuer from time to time
outstanding.

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<PAGE>

                  2.14     CERTAIN RIGHTS WHILE THE NOTES ARE IN GLOBAL FORM

                  For the avoidance of doubt, for so long as any Short Term
Trade Series Note is held in global form, any rights or benefits accruing to any
Short Term Trade Series Holder pursuant to Subsection 2.3.5(b) of Section 2.3
Interest Rates, Sections 2.8 Additional Amounts--Taxes, 2.9 Illegality, 2.10
Yield Protection, 2.11 Increased Costs and Reduced Return, and 9.12 Right of
Set-Off, shall benefit the relevant Participants and Indirect Participants.
Notwithstanding the provisions of Section 507 of the Base Indenture, such rights
and benefits shall be directly enforceable by or on behalf of the Beneficial
Owner.

                  2.15     SPECIAL TRANSFER PROVISIONS

                  2.15.1   In accordance with Section 2.2, each Short Term Trade
Series Note hereunder will be issued substantially in the form of Exhibit A
hereto in the form of one or more DTC Restricted Global Securities or Regulation
S Global Securities, in accordance with Section 202 of the Base Indenture.
Pursuant to Section 2.2.2, a beneficial owner of a Short Term Trade Series Note
may exchange its interest in a Global Security for one or more Definitive
Securities, on like terms. Transfers and exchanges subject to this Section 2.15
shall also be subject to the other provisions of the Indenture that are not
inconsistent with this Section 2.15.

                  (a)      Transfers of Interests in a DTC Restricted Global
Security to QIBs. The transfer of an interest in a DTC Restricted Global
Security to a QIB (excluding Non-U.S. Persons) may be effected only through the
book-entry system maintained by the Depositary.

                  (b)      Transfers of Definitive Restricted Securities. The
Security Registrar shall register the transfer of any Definitive Security (i) if
the proposed transferee is a Non-U.S. Person and the proposed transferor has
delivered to the Security Registrar a certificate substantially in the form of
Exhibit C hereto or (ii) if the proposed transferee is a QIB and the proposed
transferor has checked the box provided for on the form of Security stating, or
has otherwise advised the Issuer and the Security Registrar in writing, that the
sale has been made in compliance with the provisions of Rule 144A to a
transferee who has signed the certification provided for on the form of Security
stating, or has otherwise advised the Issuer and the Security Registrar in
writing, that it is purchasing the Security for its own account or an account
with respect to which it exercises sole investment discretion and that it and
any such account is a QIB and is aware that the sale to it is being made in
reliance on Rule 144A and acknowledges that it has received such information
regarding the Issuer as it has requested pursuant to Rule 144A or has determined
not to request such information and that it is aware that the transferor is
relying upon its foregoing representations in order to claim the exemption from
registration provided by Rule 144A.

                  (c)      Transfers of Interests in Regulation S Securities
Prior to the End of the Restricted Period. The following provisions shall apply
with respect to registration of any proposed transfer of interests in a
Regulation S Security prior to the end of the applicable Restricted Period:

                  (i)      The Security Registrar shall register the transfer of
         any Security (x) if the proposed transferee is a Non-U.S. Person and
         the proposed transferor has delivered

                                       18

<PAGE>

         to the Security Registrar a certificate substantially in the form of
         Exhibit C hereto or (y) if the proposed transferee is a QIB and the
         proposed transferor has checked the box provided for on the form of
         Security stating, or has otherwise advised the Issuer and the Security
         Registrar in writing, that the sale has been made in compliance with
         the provisions of Rule 144A to a transferee who has signed the
         certification provided for on the form of Security stating, or has
         otherwise advised the Issuer and the Security Registrar in writing,
         that it is purchasing the Security for its own account or an account
         with respect to which it exercises sole investment discretion and that
         it and any such account is a QIB and is aware that the sale to it is
         being made in reliance on Rule 144A and acknowledges that it has
         received such information regarding the Issuer as it has requested
         pursuant to Rule 144A or has determined not to request such information
         and that it is aware that the transferor is relying upon its foregoing
         representations in order to claim the exemption from registration
         provided by Rule 144A; and

                  (ii)     In the case of a Regulation S Global Security, if the
         proposed transferee is an Agent Member, upon receipt by the Security
         Registrar of the documents referred to in clause (i)(y) and
         instructions given in accordance with the Depositary's and Security
         Registrar's procedures, the Security Registrar shall reflect on its
         books and records the date and an increase in the principal amount of
         the DTC Restricted Global Security in an amount equal to the principal
         amount of the Regulation S Global Security to be transferred and the
         Trustee shall decrease the amount of the Regulation S Global Security
         in a like amount.

                  (d)      Transfers of Interests in Regulation S Securities to
U.S. Persons After the Restricted Period. The following provisions shall apply
with respect to any transfer of interests in a Regulation S Security to U.S.
Persons after the end of the applicable Restricted Period: The Security
Registrar shall register the transfer of any such Security without requiring any
additional certification beyond those required by other provisions of this
Indenture.

                  (e)      Transfers to Non-U.S. Persons at Any Time. The
following provisions shall apply with respect to any transfer of a Security to a
Non-U.S. Person:

                  (i)      Prior to the end of the applicable Restricted Period,
         the Security Registrar shall register any proposed transfer of any
         Security to a Non-U.S. Person upon receipt of a certificate
         substantially in the form of Exhibit C from the proposed transferor;

                  (ii)     On and after the end of the applicable Restricted
         Period, the Security Registrar shall register any proposed transfer of
         an interest in a DTC Restricted Global Security or of a Restricted
         Definitive Security to a Non-U.S. Person upon receipt of a certificate
         substantially in the form of Exhibit C from the proposed transferor;
         and

                  (iii)    (A) If the proposed transferor is an Agent Member
         holding a beneficial interest in the DTC Restricted Global Security,
         upon receipt by the Security Registrar of (x) the documents, if any,
         required by clause (ii) and (y) instructions in accordance with the
         Depositary's and Security Registrar's procedures, the Security
         Registrar shall reflect on its books and records the date and a
         decrease in the principal amount of the DTC Restricted Global Security
         in an amount equal to the principal

                                       19

<PAGE>

         amount of beneficial interest in the DTC Restricted Global Security to
         be transferred, and (B) if the proposed transferee is an Agent Member,
         upon receipt by the Security Registrar of instructions given in
         accordance with the Depositary's and Security Registrar's procedures,
         the Security Registrar shall reflect on its books and records the date
         and an increase in the principal amount of the Regulation S Global
         Security in an amount equal to the principal amount of the interest in
         the DTC Restricted Global Security to be transferred, and the Trustee
         shall decrease the principal amount of the DTC Restricted Global
         Security so transferred in a like amount.

                  (f)      Private Placement Legend. Upon the transfer, exchange
or replacement of Securities bearing the Private Placement Legend, the Security
Registrar shall deliver only Securities that bear the Private Placement Legend
unless there is delivered to the Security Registrar an Opinion of Counsel
reasonably satisfactory to the Issuer and the Trustee to the effect that neither
such legend nor the related restrictions on transfer are required in order to
maintain compliance with the provisions of the Securities Act.

                  (g)      General. By its acceptance of any Security bearing
the Private Placement Legend, each Holder of such a Security acknowledges the
restrictions on transfer of such Security set forth in this Indenture and in the
Private Placement Legend and agrees that it will transfer such Security only as
provided in this Indenture and in the Private Placement Legend. The Security
Registrar shall not register a transfer of any Security unless such transfer
complies with the restrictions on transfer contained in this Indenture and in
the Private Placement Legend. In connection with any transfer of Securities,
each Holder agrees by its acceptance of such Securities to furnish to the
Security Registrar or the Issuer such certifications, legal opinions or other
information as either of them may reasonably require to confirm that such
transfer is being made pursuant to an exemption from or a transaction not
subject to, the registration requirements of the Securities Act; provided that
the Security Registrar shall not be required to determine (but may rely on a
determination made by the Issuer with respect to) the sufficiency of any such
certifications, legal opinions or other information.

                  The Security Registrar shall retain copies of all letters,
notices and other written communications received pursuant to this Section 2.15.
The Issuer shall have the right, at its own expense, to inspect and make copies
of all such letters, notices or other written communications at any reasonable
time upon the giving of reasonable written notice to the Security Registrar.

                                   ARTICLE 3

                  3.       COVENANTS

                  In addition to the covenants contained in Articles Eight and
Ten of the Base Indenture, the Issuer agrees that, so long as any amount payable
under any Short Term Trade Series Note remains unpaid, it will comply with the
terms and covenants set forth in Annex C hereto and will comply with the terms
and covenants set forth below:

                                       20

<PAGE>

                  3.1      INFORMATION

                  The Issuer shall deliver to the New Notes Administrative Agent
(and the Administrative Agent shall, in turn, deliver to each Short Term Trade
Series Holder) all information and reports furnished to the Trustee under
Sections 703 and 1009 of the Base Indenture, in sufficient quantities for
distribution to each Beneficial Owner. In addition to the information and
reports required to be delivered pursuant to Sections 703 and 1009 of the Base
Indenture, the Issuer will also deliver to the New Notes Administrative Agent
(and the New Notes Administrative Agent shall, in turn, deliver to each
Beneficial Owner), in sufficient quantities for distribution to each Beneficial
Owner, for so long as any Short Term Trade Series Notes are outstanding, within
60 days after the end of each fiscal quarter, (a) the Eligible Trade
Transactions Report, together with a statement certified by a senior officer of
the Issuer that no other financing is currently outstanding for an amount of
Eligible Trade Transactions needed to comply with the terms of the Transaction
Documents, and (b) a quarterly report setting forth account statements from cash
collection banks evidencing that cash proceeds in an amount equal to no less
than 1.10 times the Debt Service amount (or such other ratio as permitted by the
Transaction Documents) with respect to all Trade Series Notes for such fiscal
quarter have been credited in U.S. Dollars to operating accounts held in the
name of the Issuer.

                  3.2      USE OF PROCEEDS

                  The Short Term Trade Series Notes shall be issued to the Short
Term Trade Series Holders to refinance existing indebtedness to Holders pursuant
to the terms of the Note Purchase Agreement and the Settlement Agreements
annexed thereto.

                  3.3      CNV FILING

                  After the Takedown with respect to each of the Short Term
Trade Series Notes, the Issuer shall promptly (i) make the CNV Filing and
provide the CNV with all required documents (including a certified Spanish
translation of the Note Documents) in connection therewith and (ii) inform the
New Notes Administrative Agent (which, in turn, will inform the Short Term Trade
Series Holders) as to its compliance herewith.

                  3.4      MONEY FOR SECURITY PAYMENTS TO BE HELD IN TRUST

                  Clause (ii) of the fifth paragraph of Section 1003 of the Base
Indenture permitting the giving of notice by publication in a newspaper shall
not apply to the Short Term Trade Series Notes.

                  3.5      CURRENCY OF PAYMENT

                  The Issuer agrees that, notwithstanding any foreign exchange
restriction or prohibition in Argentina, any and all payments hereunder shall be
made exclusively in Dollars in immediately available funds. In the event any
such foreign exchange restriction or prohibition is in effect, the Issuer shall
during the continuance of such prohibition at its own expense, obtain such
Dollars including, (i) by purchasing in Argentina (in compliance with any
applicable Argentine Central Bank or other Governmental Authority regulation in
force at the time of such

                                       21

<PAGE>

purchase), any Dollar denominated public or private debt or equity tradable
security issued in Argentina and tradable in foreign markets and transferring
and selling the same outside of Argentina for Dollars, or (ii) by means of any
other legal and appropriate mechanism for the acquisition of Dollars. No form of
payment shall be deemed to constitute payment of the applicable Obligation until
receipt of the full amount of Dollars due in respect thereof. All costs,
expenses and taxes payable in connection with this Section 16 shall be for the
account of the Issuer.

                                   ARTICLE 4

                  4.       REPRESENTATIONS AND WARRANTIES

                  The representations and warranties of the Issuer, as set forth
in Annex B hereto, are incorporated herein by reference in their entirety.

                                   ARTICLE 5

                  5.       DEFAULTS

                  5.1      EVENTS OF DEFAULT

                  Upon the occurrence of any Event of Default set forth in Annex
D hereto, the Trustee, at the written direction of the Majority Holders, by
notice in writing to the Issuer (and to the Trustee if given by Short Term Trade
Series Holders), may declare the principal amount of all the Short Term Trade
Series Notes then outstanding and all interest and other amounts of Debt Service
accrued thereon to be due and payable immediately, and upon any such declaration
the same shall become and shall be immediately due and payable (to the extent
not already due and payable), anything in the Indenture or herein contained to
the contrary notwithstanding. If an Event of Default described in Clauses (i),
(j) or (k) of the Events of Default set forth in Annex D, other than in the case
of Material Subsidiaries, occurs and is continuing, then and in each and every
such case, the principal amount of all the Short Term Trade Series Notes then
outstanding and all interest and other amounts of Debt Service accrued thereon
shall, without any notice to the Issuer or any other act on the part of the
Trustee or any Short Term Trade Series Holder, become and be immediately due and
payable, anything in the Indenture or herein contained to the contrary
notwithstanding. In addition, the Majority Holders may instruct the Trustee to
take any action permitted by Section 503 of the Base Indenture.

                  At any time after such a declaration of acceleration has been
made with respect to the Short Term Trade Series Notes and before a judgment or
decree for payment of the money due has been obtained by the Trustee as provided
in Article Five of the Base Indenture, the Required Holders, by written notice
to the Issuer and the Trustee, may rescind and annul such declaration and its
consequences if

                  (1)      the Issuer has paid or deposited with the Trustee a
         sum in Dollars sufficient to pay

                                       22

<PAGE>

                           (A)      all overdue installments of interest on the
                  Short Term Trade Series Notes, and

                           (B)      the principal of (and premium, if any, on)
                  any Short Term Trade Series Notes which have become due
                  otherwise than by such declaration of acceleration, and
                  interest thereon at the rate or rates prescribed therefor by
                  the terms of the Short Term Trade Series Notes to the extent
                  that payment of such interest is lawful, and

                           (C)      interest upon overdue installments of
                  interest at the rate or rates prescribed therefor by the terms
                  of the Short Term Trade Series Notes to the extent that
                  payment of such interest is lawful, and

                  (2)      all Events of Default in respect of Short Term Trade
         Series Notes, other than the nonpayment of the principal of the Short
         Term Trade Series Notes which has become due solely by such
         acceleration, have been cured or waived as provided in Section 513 of
         the Base Indenture.

                  No such rescission shall affect any subsequent default or
impair any right consequent thereon.

                  The foregoing provisions shall be without prejudice to the
rights accorded to any individual Short Term Trade Series Holder to initiate
actions against the Issuer under New York State law or Section 29 of the
Negotiable Obligations Law. The Trustee, the Registrar and the Paying Agents
shall be entitled to assume that no such proceedings have been instituted,
unless they have received written notice from a Short Term Trade Series Holder
or the Issuer to the contrary.

                  5.2      WAIVER OF PAST DEFAULTS

                  Notwithstanding the provisions of Section 513 of the Base
Indenture, action by the Majority Holders shall be required for the waiver of
past uncured defaults in respect of the Short Term Trade Series Notes as
provided in Section 513 of the Base Indenture.

                  5.3      NOTICE OF DEFAULTS

                  The provisions of Section 602 of the Base Indenture shall not
apply to the Short Term Trade Series Notes and the following shall be
substituted therefor in respect of Short Term Trade Series Notes and for all
purposes of this Short Term Trade Series Supplemental Indenture:

                  "Section 602. Notice of Defaults. Promptly after the
occurrence of any Event of Default, the Trustee shall transmit by mail to all
Short Term Trade Series Holders and Short Term Trade Series Agents, as their
names and addresses appear in the Security Register, notice of such Event of
Default hereunder actually known to a Responsible Officer of the Trustee, unless
such default shall have been cured or waived."

                                       23

<PAGE>

                                   ARTICLE 6

                  6.       THE SHORT TERM TRADE SERIES AGENTS AND THE TRUSTEE

                  6.1      APPOINTMENT AND AUTHORIZATION

                  6.1.1    The Issuer irrevocably appoints and authorizes, and
by its acceptance of any Short Term Trade Series Note each Short Term Trade
Series Holder irrevocably appoints and authorizes, in each case to the fullest
extent permitted under applicable law, (i) The Bank of New York as Co-Security
Registrar, Authenticating Agent, Paying Agent and Transfer Agent, and, (ii)
Banco Rio de la Plata S.A., as Security Registrar, Argentine Paying Agent and
Transfer Agent, and (iii) JPMorgan Chase as Administrative Agent and Calculation
Agent, in respect of the Short Term Trade Series Notes (each of The Bank of New
York, Banco Rio de la Plata S.A. and JPMorgan Chase, in its relevant agency
capacities hereunder, a "Short Term Trade Series Agent" and together the "Short
Term Trade Series Agents"), to take such action as agent in respect of the Short
Term Trade Series Notes and to exercise such powers under this Short Term Trade
Series Supplemental Indenture and the Short Term Trade Series Notes as are
specifically delegated to the relevant Short Term Trade Series Agents in such
respective capacities by the terms hereof or thereof, together with all such
powers as are reasonably incidental thereto (including, but not limited to, all
the duties that would normally be performed by the Trustee as Co-Security
Registrar, Principal Paying Agent, Transfer Agent and Authenticating Agent under
the Indenture). In addition to any notice required by this Short Term Trade
Series Supplemental Indenture, each such Short Term Trade Series Agent shall
give the Trustee prompt notice of any action taken by such Short Term Trade
Series Agent in compliance with its duties as Administrative Agent, Security
Registrar, Paying Agent, Authenticating Agent and Transfer Agent.

                  6.1.2    The Bank of New York shall, as Co-Security Registrar,
keep a registry of each of the Short Term Trade Series Notes, containing the
information elicited from the Short Term Trade Series Holders in such Short Term
Trade Series Holders' Administrative Questionnaire, as well as a record of (i)
all transfers of each of the Short Term Trade Series Notes and all liens created
upon each of the Short Term Trade Series Notes, (ii) auctions (if any) of each
of the Short Term Trade Series Notes by pledgors or as holders of a security
interest thereon and (iii) decisions by courts of law regarding transfers of,
and the creation or cancellation of any liens and attachments on, each of the
Short Term Trade Series Notes. The Security Registrar agrees to provide any such
information, upon request, to the Administrative Agent and the Paying Agent. The
designation of The Bank of New York as Co-Security Registrar, Transfer Agent, in
each case shall be without prejudice to the designation of Banco Rio de la Plata
S.A., as the Security Registrar, who will keep a like original register in
Argentina as provided in Section 305 of the Base Indenture.

                  6.1.3    (i) Except to the extent imposed by non-waivable
provisions of applicable law, the Trustee shall have no responsibility to the
Short Term Trade Series Holders in respect of any obligation delegated to the
New Notes Administrative Agent by the terms hereof. The Trustee shall have no
liability for any acts or omissions of the New Notes Administrative Agent.
Notwithstanding the provisions of the Indenture, the Trustee shall have no
liability for the fees or

                                       24

<PAGE>

expenses of the New Notes Administrative Agent in its capacity as Authenticating
Agent (if the New Notes Administrative Agent acts as Authenticating Agent).

                  (ii)     Except to the extent imposed by non-waivable
provisions of applicable law, the New Notes Administrative Agent shall have no
responsibility to the Short Term Trade Series Holders in respect of any
obligation delegated to the Trustee by the terms hereof. The New Notes
Administrative Agent shall have no liability for any acts or omissions of the
Trustee.

                  6.2      AGENT AND AFFILIATES

                  For so long as JPMorgan Chase, Banco Rio de la Plata S.A., or
any of their affiliates is a Short Term Trade Series Holder, JPMorgan Chase,
Banco Rio de la Plata S.A., or such affiliate shall have the same rights and
powers under the Indenture as any other Short Term Trade Series Holder and may
exercise or refrain from exercising the same as though it or one of its
affiliates were not the New Notes Administrative Agent, Calculation Agent,
Security Registrar, Argentine Paying Agent, and/or Transfer Agent (as the case
may be) and its affiliates may accept deposits from, lend money to, and
generally engage in any kind of business with the Issuer or any Subsidiary or
Affiliate of the Issuer as if it were not acting in such agency capacities.

                  6.3      ACTION BY SHORT TERM TRADE SERIES AGENTS

                  The obligations of the Short Term Trade Series Agents
hereunder are only those expressly set forth herein, provided that a Short Term
Trade Series Agent may (but is not obligated to) act hereunder and under the
other Note Documents in its reasonable discretion or pursuant to the
instructions of the Majority Holders in respect of the Short Term Trade Series
Notes, provided that if such instructions are conflicting or unclear, the Short
Term Trade Series Agent that has received such instructions may request
reasonable clarification thereof and will not be obligated to act pursuant to
such instructions until clarified in a satisfactory manner. Without limiting the
generality of the foregoing, a Short Term Trade Series Agent shall not be
required to take any action with respect to any Event of Default, except as
expressly provided in Article 5, shall not be a trustee for or have any
fiduciary duty with respect to any Short Term Trade Series Holder or any other
Person hereunder and shall not be acting as a Trustee, under the Trust Indenture
Act or otherwise. Notwithstanding the last sentence of the second paragraph of
Section 5.1, no Short Term Trade Series Agent shall enter into any legal
proceedings on behalf of a Short Term Trade Series Holder without the prior
written consent of such Short Term Trade Series Holder. A Short Term Trade
Series Agent shall not be obligated to take any action, unless directed by the
Majority Holders in respect of the Short Term Trade Series Notes, which would
require it to expend its own funds or incur monetary liability unless it has
received adequate assurance that it shall receive satisfactory indemnity
therefor.

                  6.4      CONSULTATION; ADDITIONAL AGENTS

                  Any Short Term Trade Series Agent may consult with legal
counsel (who may be counsel for the Issuer, provided that any consultation with
counsel for the Issuer shall only occur with the consent of the Issuer, which
consent shall not be unreasonably withheld), independent

                                       25

<PAGE>

public accountants and other experts selected by it and shall not be liable for
any action taken or omitted to be taken by it in good faith in accordance with
the advice of such counsel, accountants or experts. Any Short Term Trade Series
Agents may appoint an agent or agents (including an Affiliate of such Short Term
Trade Series Agent) to perform its duties and obligations under this Short Term
Trade Series Supplemental Indenture and the other Note Documents. Any other
agent appointed in accordance with the provisions of this Section 6.4 shall
enjoy the same protections, immunities and indemnities as are provided for in
this Short Term Trade Series Supplemental Indenture.

                  6.5      LIABILITY OF SHORT TERM TRADE SERIES AGENTS

                  None of the Short Term Trade Series Agents nor any of their
Affiliates nor any of their respective directors, officers, agents, advisors or
employees shall be liable to any Short Term Trade Series Holder for any action
taken or not taken by it in connection herewith (i) with the express written
consent of or at the express written request of the Majority Holders in respect
of the Short Term Trade Series Notes or (ii) in the absence of its own gross
negligence or willful misconduct. None of the Short Term Trade Series Agents nor
any of their Affiliates nor any of their respective directors, officers, agents,
advisors or employees shall be responsible for or have any duty to ascertain,
inquire into or verify (i) any statement, warranty or representation made in
connection with this Short Term Trade Series Supplemental Indenture or any
issuance or sale of Short Term Trade Series Notes hereunder; (ii) the
performance or observance of any of the covenants or agreements of the Issuer;
(iii) the satisfaction of any condition specified in the Note Documents; or (iv)
the validity, effectiveness or genuineness of this Short Term Trade Series
Supplemental Indenture, the Short Term Trade Series Notes or any other
instrument or writing furnished in connection herewith. The New Notes
Administrative Agent shall not incur any liability to any Short Term Trade
Series Holder by acting in reliance upon any notice, consent, certificate,
statement or writing (which may be a bank wire, facsimile transmission or
similar writing) reasonably believed by it to be genuine or to be signed by the
proper party or parties.

                  6.6      SUCCESSOR AGENT

                  6.6.1    Subject to appointment of a successor, the New Notes
Administrative Agent may resign at any time, and the Majority Holders may remove
the New Notes Administrative Agent in respect of the Short Term Trade Series
Notes at any time by giving notice thereof to the New Notes Administrative
Agent, the Trustee, each Short Term Trade Series Holder, the CNV and the Issuer.
Upon any such pending resignation or removal, the Issuer shall have the right to
appoint a successor agent, which appointment shall be subject to the approval of
the Majority Holders. The Issuer shall give the Trustee prompt notice of such
appointment. If no successor New Notes Administrative Agent shall have been so
appointed by the Issuer and have accepted such appointment within 30 days after
the retiring Administrative Agent gives notice of resignation or the Majority
Holders give notice of such removal, then the retiring New Notes Administrative
Agent may, at the expense of the Issuer, on behalf of the Majority Holders and
the Issuer, appoint a successor New Notes Administrative Agent, which shall be a
commercial bank organized or licensed under the laws of the United States of
America or of any State thereof and having a combined capital and surplus of at
least U.S.$400,000,000 and notify the Issuer, the Trustee and each of the Short
Term Trade Series Holders of such appointment. Upon the acceptance of its
appointment as New Notes Administrative Agent

                                       26

<PAGE>

hereunder by a successor New Notes Administrative Agent, such successor New
Notes Administrative Agent shall give notice thereof to the Trustee and the CNV
and shall thereupon succeed to and become vested with all the rights and duties
of the retiring New Notes Administrative Agent, and the retiring New Notes
Administrative Agent shall be discharged from its duties and obligations
hereunder. After any retiring Administrative Agent's registration or removal
hereunder as New Notes Administrative Agent, the provisions of this Article
shall inure to its benefit as to any actions taken or omitted to be taken by it
while it was New Notes Administrative Agent.

                  6.6.2    The terms and conditions of Section 6.6.1 shall apply
mutatis mutandis to the appointment of any successor Paying Agent or Calculation
Agent (including with respect to the rights and obligations of each Paying Agent
and Calculation Agent).

                  6.7      APPLICATION OF MONEY COLLECTED

                  Any money collected by the Trustee with respect to the Short
Term Trade Series Notes pursuant to Article Five of the Base Indenture shall,
notwithstanding any provision to the contrary of Section 506 of the Base
Indenture, be applied in the following order of priority, at the date or dates
fixed by the Trustee and, in case of the distribution of such money on account
of principal (or premium, if any) or interest, upon presentation of the Short
Term Trade Series Notes and the notation thereon of the payment if only
partially paid and upon surrender thereof if fully paid:

                  FIRST: (i) to pay all amounts due to the Trustee in respect of
         the Short Term Trade Series Notes under Section 607 of the Base
         Indenture and (ii) ratably, to pay all amounts then due and payable to
         the Trustee and the Short Term Trade Series Agents in respect of the
         Short Term Trade Series Notes under the Note Documents.

                  SECOND: ratably, to pay to the Short Term Trade Series Holders
         the regularly scheduled interest (not including Default Interest)
         accrued and unpaid in respect of the Short Term Trade Series Notes.

                  THIRD: ratably, to pay to the Short Term Trade Series Holders
         the unpaid principal then due and payable in respect of the Short Term
         Trade Series Notes.

                  FOURTH: ratably, to pay to any applicable payee any other
         unpaid Note Payment amount with respect to the Short Term Trade Series
         Notes (including, without limitation, Default Interest then accrued and
         unpaid) then due and payable.

                  FIFTH: after the payment and satisfaction in full of all Note
         Payment obligations with respect to the Short Term Trade Series Notes,
         to pay the remaining balance, if any, to the Issuer; each such payment
         to be made without preference or priority of any kind.

                                       27

<PAGE>

                  6.8      REMOVAL OF TRUSTEE

                  Notwithstanding the provisions of Section 609(c) of the Base
Indenture, action by Majority Holders shall be required to remove the Trustee
with respect to the Short Term Trade Series Notes under the provisions of
Section 609(c) of the Base Indenture.

                  6.9      INDEMNIFICATION

                  The Issuer agrees to indemnify and hold harmless each of the
Trustee, each Short Term Trade Series Agent, each Short Term Trade Series Holder
and each of their Affiliates and their officers, directors, employees, agents
and advisors (each, an "Indemnified Party") from and against any and all claims,
damages, losses, costs and other liabilities and expenses (including, without
limitation, reasonable fees and expenses of counsel) that may be incurred by or
asserted or awarded against any Indemnified Party, in each case arising out of
or in connection with or by reason of (including, without limitation, in
connection with any investigation, litigation or proceeding or preparation of a
defense in connection therewith) the Note Documents, any of the transactions
contemplated thereby or the engagement of any Indemnified Party pursuant to, and
the performance by any Indemnified Party of the services contemplated by, the
Note Documents and will reimburse each Indemnified Party for all out-of-pocket
expenses; provided that no Indemnified Party shall have any right to be
indemnified hereunder for its own willful misconduct or gross negligence, as
determined in a final, non-appealable judgment by a court of competent
jurisdiction. In the case of an investigation, litigation or other proceeding to
which the indemnity in this Section 6.9 applies, such indemnity shall be
effective whether or not such investigation, litigation or proceedings is
brought by the Issuer, its directors, shareholders or creditors or an
Indemnified Party or any other Person or any Indemnified Party is otherwise a
party thereto and whether or not the transactions contemplated hereby are
consummated. The Issuer also agrees that no Indemnified Party shall have any
liability (whether direct or indirect, in contract, tort or otherwise) to the
Issuer or any of its Affiliates related to or arising out of the engagement of
any Indemnified Party pursuant to, or the performance by any Indemnified Party
of the services contemplated by, any of the Documents, except to the extent that
any loss, claim, damage or liability is finally judicially determined to have
resulted primarily from such Indemnified Party's gross negligence or willful
misconduct. The Issuer agrees that no Indemnified Party shall be liable under
the Documents, or in respect of the Short Term Trade Series Notes or any
transactions related thereto, for any special, indirect, consequential or
punitive damages.

                  6.10     SURVIVAL

                  The provisions of this Article 6 shall survive the resignation
or removal of any Short Term Trade Series Agent or the termination or expiration
of any Note Document.

                                       28

<PAGE>

                                   ARTICLE 7

                  7.       SECURITYHOLDERS' LISTS AND COMPANY INFORMATION

                  7.1      PRESERVATION OF INFORMATION; COMMUNICATIONS TO
                           HOLDERS

                  Notwithstanding the provisions of Section 702(b) of the Base
Indenture, any single Short Term Trade Series Holder may, regardless of the
period for which it has held Short Term Trade Series Notes, at any time apply in
writing to the Trustee stating that such Short Term Trade Series Holder desires
to communicate with the Short Term Trade Series Holders, and the Trustee shall
promptly afford any such applicant access to the information preserved by the
Trustee in accordance with Section 702(a) of the Base Indenture.

                                   ARTICLE 8

                  8.       REDEMPTION OF SECURITIES

                  8.1      SELECTION OF SHORT TERM TRADE SERIES NOTES TO BE
                           REDEEMED

                  Notwithstanding the provisions of Section 1103 of the Base
Indenture, any redemption of Short Term Trade Series Notes as contemplated
thereby shall be pro rata by principal amount as among the Holders of all Short
Term Trade Series Notes outstanding at the time of such redemption.

                  8.2      PURCHASE OF SECURITIES BY THE ISSUER

                  The provisions of Section 1110 of the Base Indenture shall not
apply to the Short Term Trade Series Notes and neither the Issuer nor any of its
Subsidiaries or Affiliates shall be permitted to purchase the Short Term Trade
Series Notes in the open market, by tender or in any privately negotiated
transaction or otherwise.

                                   ARTICLE 9

                  9.       MISCELLANEOUS

                  9.1      INCORPORATION OF INDENTURE

                  Under this Short Term Trade Series Supplemental Indenture and
in accordance with the terms and provisions of the Short Term Trade Series
Notes, the following Provisions of the Base Indenture are superseded and of no
force or effect with respect to the Short Term Trade Series Notes: Sections 502,
602, and Article 12. In all other respects the Base Indenture, as supplemented
by and, in the case of Articles 8 and 10 of the Base Indenture as modified or
supplemented by Article 3 hereof and in the case of Sections 117, 506, 513,
609(c) of the Base Indenture, as modified or supplemented by Sections 9.5, 5.1,
6.7, 5.2 and 6.8 respectively, of this Short Term Trade Series Supplemental
Indenture, is in all respects ratified, confirmed and approved and, with respect
to the Short Term Trade Series Notes, the Base Indenture as supplemented and
amended by this Short Term Trade Series Supplemental Indenture shall be read,
taken and construed as one and the same instrument.

                                       29

<PAGE>

                  9.2      NOTICES

                  All notices, requests and other communications to any party
hereunder shall, in addition to any requirements under applicable Argentine law,
be in writing (including bank wire, telex, facsimile transmission or similar
writing) and shall be given to such party:

                  9.2.1    in the case of the Issuer, the Trustee, the Security
Registrar, the Co-Security Registrar, the Paying Agent, the Argentine Paying
Agent, the New Notes Administrative Agent, the Calculation Agent, the
Authenticating Agent or the Transfer Agent at its address, facsimile number or
telex number set forth on the signature pages hereof, or

                  9.2.2    in the case of any party, at such other address,
facsimile number or telex number as such party may hereafter specify for the
purpose by notice to the Administrative Agent and the Issuer in accordance with
the terms of this Section 9.

                  Notwithstanding any other provision of the Indenture or this
Short Term Trade Series Supplemental Indenture each such notice, request or
other communication shall be effective (i) if given by telex, when such telex is
transmitted to the telex number specified in or pursuant to this Section and the
appropriate answerback is received, (ii) if given by facsimile transmission,
when transmitted to the facsimile number specified in or pursuant to this
Section and confirmation of receipt is received, (iii) if given by mail, upon
receipt or (vi) if given by any other means, when delivered at the address
specified in or pursuant to this Section; provided that notices to the
Administrative Agent and the Issuer under Article 2 shall not be effective until
received.

                  9.3      NO WAIVERS

                  No failure or delay by the Trustee, the Short Term Trade
Series Agents or any Short Term Trade Series Holder in exercising any right,
power or privilege hereunder or under any Short Term Trade Series Note shall
operate as a waiver thereof, nor shall any single or partial exercise thereof
preclude any other or further exercise thereof or the exercise of any other
right, power or privilege. The rights and remedies herein provided shall be
cumulative and not exclusive of any rights or remedies provided by law.

                  9.4      AMENDMENTS AND WAIVERS; SUPPLEMENTAL INDENTURE

                  Any provision of the Indenture or this Short Term Trade Series
Supplemental Indenture may be amended, supplemented or waived in any manner
affecting the Short Term Trade Series Holders, if, but only if, such amendment,
supplement or waiver is in writing and is signed by the Trustee, the Issuer and
the Short Term Trade Series Agents (with the consent of the Required Holders);
provided that no such amendment or waiver shall, unless consented to by all the
Short Term Trade Series Holders (i) reduce the principal of or rate of interest
on any Short Term Trade Series Note, (ii) postpone the date fixed for any
payment of principal of or interest on any Short Term Trade Series Note or any
fees or other amounts payable hereunder, (iii) change the percentage of the
aggregate unpaid principal amount of the Short Term Trade Series Notes or the
number of Short Term Trade Series Holders which shall be required to take any
action under this Section or any other provision of this Short Term Trade Series
Supplemental

                                       30

<PAGE>

Indenture, (iv) change the currency of payment, (v) change any place of payment,
(vi) change the ranking of the Short Term Trade Series Notes, (vii) change the
governing law under Section 9.11 or (viii) change the definition of "Required
Holder" or "Majority Holder." The foregoing shall be without prejudice to
Section 902 of the Base Indenture.

                  9.5      JUDGMENT CURRENCY

                  If for the purposes of obtaining a judgment in any court
enforcing the obligations of the Issuer hereunder or under the Short Term Trade
Series Notes it is necessary to convert a sum due from the Issuer in Dollars
into another currency, the parties hereto agree, to the fullest extent that they
may effectively do so, that the rate of exchange used shall be that at which in
accordance with normal banking procedures, the Trustee or each Short Term Trade
Series Holder as the case may be could purchase Dollars with such currency at or
about 11:00 a.m. (New York City time) on the Business Day preceding the day on
which final judgment is given.

                  The obligations of the Issuer in respect of any sum due to any
Short Term Trade Series Holder hereunder or under the Short Term Trade Series
Notes shall, notwithstanding any judgment in a currency other than Dollars, be
discharged only to the extent that on the Business Day following receipt by such
Short Term Trade Series Holder of any sum adjudged to be so due in such other
currency, the Trustee or any Short Term Trade Series Holder, as the case may be,
may, in accordance with normal banking procedures purchase Dollars with such
other currency. If the amount of Dollars so purchased is less than the sum
originally due to such Short Term Trade Series Holder in Dollars, the Issuer
agrees, to the fullest extent that it may effectively do so, as a separate
obligation and notwithstanding any such judgment, to indemnify the Trustee or
such Short Term Trade Series Holder as the case may be against such loss, and if
the amount of U.S. Dollars so purchased exceeds the sum originally due to such
Short Term Trade Series Holder, such Short Term Trade Series Holder shall remit
such excesses to the Issuer.

                  9.6      WAIVER OF JURY TRIAL

                  EACH OF THE ISSUER, THE SHORT TERM TRADE SERIES AGENTS AND THE
SHORT TERM TRADE SERIES HOLDERS HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT
PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL
PROCEEDING ARISING OUT OF OR RELATING TO THIS SHORT TERM TRADE SERIES
SUPPLEMENTAL INDENTURE OR THE TRANSACTIONS CONTEMPLATED HEREBY.

                  9.7      SUBMISSION TO JURISDICTION; SERVICE OF PROCESS;
                           WAIVER OF ARRAIGO

                  9.7.1    The parties to this Short Term Trade Series
Supplemental Indenture hereby submit to the nonexclusive jurisdiction of the
United States District Court of the Southern District of New York and of any New
York State court sitting in New York City for the purposes of all legal
proceedings arising out of or relating to this Short Term Trade Series
Supplemental Indenture or the transactions contemplated hereby. The parties to
this Short Term Trade Series Supplemental Indenture irrevocably waive, to the
fullest extent permitted by law, any objection which they may now or hereafter
have to the laying of the venue of any such proceedings

                                       31

<PAGE>

brought in such a court and any claim that any such proceeding brought in such a
court has been brought in an inconvenient forum.

                  9.7.2    The Issuer hereby agrees that service of all writs,
process and summonses in any such suit, action or proceeding brought in any New
York State or Federal court sitting in New York City may be made upon CT
Corporation System, presently located at 111 Eighth Avenue, New York, NY 10011
(the "Process Agent"), and the Issuer hereby irrevocably appoints the Process
Agent its true and lawful agent in its name, place and stead to accept such
service of any and all such writs, process and summonses, and agrees that the
failure of the Process Agent to give any notice of any such service of process
to it shall not impair or affect the validity of such service or of any judgment
based thereon. As an alternative method of service, the Issuer also irrevocably
consents to the service of any and all process in any such suit, action or
proceeding in such New York State or Federal court sitting in New York City by
the mailing of copies of such process to the Issuer.

                  9.7.3    The parties to this Short Term Trade Series
Supplemental Indenture hereby irrevocably waive, to the fullest extent now or
hereafter permitted under the laws of Argentina or other relevant jurisdiction,
the right to demand that any Short Term Trade Series Agent or any Short Term
Trade Series Holder post a performance bond or guarantee (excepcion de arraigo)
in any action or proceeding initiated against the parties to this Short Term
Trade Series Supplemental Indenture in Argentina in connection with this Short
Term Trade Series Supplemental Indenture, the other Note Documents or the
transactions contemplated hereby or thereby.

                  Nothing in this Section 9.7 shall affect the right of any
party hereto to serve process in any manner permitted by law, or limit any right
that any party hereby may have to bring proceedings against any other party
hereto in the courts of any jurisdiction or to enforce in any lawful manner a
judgment obtained in one jurisdiction in any other jurisdiction.

                  9.8      WAIVER OF SOVEREIGN IMMUNITY

                  To the extent that the parties to this Short Term Trade Series
Supplemental Indenture have or hereafter may be entitled to claim or may
acquire, for themselves or any of their assets, any immunity from suit,
jurisdiction of any court or from any legal process (whether through service of
notice, attachment prior to judgment, attachment in aid of execution, or
otherwise) with respect to themselves or their property, they hereby irrevocably
waive such immunity in respect of their obligations hereunder and under the
other Note Documents to the fullest extent permitted by applicable law and,
without limiting the generality of the foregoing, agree that the waivers set
forth in this Section 9.8 shall be effective to the fullest extent now or
hereafter permitted under the Foreign Sovereign Immunities Act of 1976 of the
United States and are intended to be irrevocable for purposes of such Act to the
extent permitted thereby.

                  9.9      KNOWLEDGE OF TRUSTEE

                  The Trustee shall not be deemed to have knowledge of any
amendment to any Note Document to which it is not party unless it has received a
copy thereof from the Administrative Agent, certified by the New Notes
Administrative Agent to be a true and correct

                                       32

<PAGE>

copy thereof. No amendment to any Note Document which affects the rights and
obligations of the Trustee hereunder shall be effective without the consent of
the Trustee thereto.

                  9.10     MODIFICATION OF THE INDENTURE

                  Except as expressly modified by this Short Term Trade Series
Supplemental Indenture or any other Note Document, the provisions of the
Indenture shall govern the terms and conditions of the Short Term Trade Series
Notes.

                  9.11     GOVERNING LAW

                  This Short Term Trade Series Supplemental Indenture and each
Short Term Trade Series Note shall be governed by and construed and interpreted
in accordance with the law of the State of New York; provided that all matters
relating to the due authorization, execution, issuance and delivery of the Short
Term Trade Series Notes by the Issuer, the approval thereof by the CNV for the
offering of the Short Term Trade Series Notes to the public in Argentina and
matters relating to the legal requirements necessary for the Short Term Trade
Series Notes to qualify as obligaciones negociables under Argentine law shall be
governed by the Negotiable Obligations Law and other applicable Argentine laws
and regulations.

                  9.12     RIGHT OF SET-OFF

                  Upon the occurrence and during the continuance of any Event of
Default, and so long as any payment obligation is owing under the Indenture or
any Short Term Trade Series Notes by the Issuer to any Short Term Trade Series
Note Holder, each such Holder and each of its Affiliates is hereby authorized at
any time and from time to time, to the fullest extent permitted by law, to set
off and apply any and all deposits (general or special, time or demand,
provisional or final) at any time, held and other indebtedness at any time owing
by such Holder or such Affiliate to or for the credit or the account of the
Issuer against any and all of the obligations of the Issuer now or hereafter
existing under the Indenture or any Short Term Trade Series Notes held by such
Holder, whether or not such Holder shall have made any demand under the
Indenture or any Short Term Trade Series Note and although such obligations may
be unmatured. The rights of each Holder and its Affiliates under this Section
9.12 are in addition to other rights and remedies that such Holder and its
Affiliates may have. Any Holder exercising its rights under this Section 9.12
shall give notice thereof to the Issuer and the New Notes Administrative Agent
promptly after the exercise of such rights; provided that failure to give such
notice shall not affect the validity of such exercise.

                  9.13     COUNTERPARTS

                  This Short Term Trade Series Supplemental Indenture may be
signed in any number of counterparts, each of which shall be an original, with
the same effect as if the signatures thereto and hereto were upon the same
instrument.

                                       33

<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have caused this Short
Term Trade Series Supplemental Indenture to be duly executed by their respective
authorized officers all as of the day and year first above written.

                                            PECOM ENERGIA S.A.

Address:                                    By: ________________________________
                                                Name:
       Maipu 1, Piso 20                         Title:
       C1084ABA Buenos Aires
       Argentina

       Attn:  [_____________]               By: ________________________________
                                                Name:
Fax Number:                                     Title:
(5411) 4344-6325

<PAGE>

                                            THE BANK OF NEW YORK, as
                                            Trustee, Co-Security
                                            Registrar, Authenticating
                                            Agent, Paying Agent and
                                            Transfer Agent

Address:                                    By: ________________________________
                                                Name:
      [101 Barclay St                           Title:
      Floor 21 West
      New York, NY 10286]

      Attn: [_____________]

Fax Number:
         (212) 815-5802

<PAGE>

                                            BANCO RIO DE LA PLATA S.A., as
                                            Security Registrar, Argentine Paying
                                            Agent and Transfer Agent

Address:                                    By: ________________________________
                                                Name:
      [Bartolome Mitre 480-Piso 6 (to)
      Buenos Aires, Argentina]

      Attn: [Eduardo Rodriguez Sapey]

Fax Number:
     [(5411) 4341-1013
     (5411) 4341-2827]

<PAGE>

                                            JPMORGAN CHASE, as Administrative
                                              Agent and as Calculation Agent

Address:                                    By: ________________________________
                                                Name:
      [1 Chase Manhattan Plaza                  Title:
      8th Floor
      New York, NY 10081

      Attn: [Lascelles Thompson/Ora Summerlin]

Fax Number:
      (212) 552-5646

<PAGE>

                                                                       EXHIBIT A

                               TO SHORT TERM TRADE SERIES SUPPLEMENTAL INDENTURE

          [FORM OF SHORT TERM FLOATING RATE TRADE SERIES NOTE DUE 2003]

                              [FORM OF GLOBAL NOTE]

CUSIP NO.: [              ]

Unless this certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Issuer or its
agent for registration of transfer, exchange or payment, and any certificate
issued is registered in the name of Cede & Co. or in such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

                               PECOM ENERGIA S.A.

                  Incorporated in Argentina as a sociedad anonima (a corporation
with limited liability) on November 6, 1946, having legal domicile at Maipu 1,
Buenos Aires, Argentina registered with the Public Registry of Commerce
(Registro Publico del Comercio) on November 17, 1947 under No. 759, Folio 569,
Book 47, Volume A of the Estatutos Nacionales, with a term expiring on June 18,
2046.

                   [DTC RESTRICTED][REGULATION S] GLOBAL NOTE

                               representing up to
                                   US$[      ]
                           Aggregate Principal Amount
                                       of
                           Floating Rate Notes due [ ]

US$[       ]                                                            No. [  ]

[TO BE INCLUDED ONLY ON RESTRICTED NOTE] THIS DTC RESTRICTED GLOBAL NOTE HAS NOT
BEEN AND WILL NOT BE REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), AND MAY NOT BE RESOLD, PLEDGED OR OTHERWISE
TRANSFERRED EXCEPT AS PERMITTED BY THE FOLLOWING SENTENCES. THE HOLDER HEREOF,
BY ITS ACCEPTANCE OF THIS REGISTERED GLOBAL NOTE, REPRESENTS, ACKNOWLEDGES AND
AGREES THAT IT WILL NOT REOFFER, RESELL, PLEDGE OR OTHERWISE TRANSFER THIS
REGISTERED GLOBAL NOTE EXCEPT (A) IN COMPLIANCE WITH RULE 144A UNDER THE
SECURITIES ACT, TO A PERSON WHOM THE SELLER REASONABLY BELIEVES

                                      A-1

<PAGE>

IS A QUALIFIED INSTITUTIONAL BUYER; (B) PURSUANT TO AN EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF
AVAILABLE AND UPON DELIVERY OF AN OPINION OF COUNSEL IN A FORM SATISFACTORY TO
THE ISSUER); (C) OUTSIDE THE UNITED STATES IN COMPLIANCE WITH RULE 903 OR 904 OF
REGULATION S UNDER THE SECURITIES ACT; OR (D) TO AN INSTITUTION THAT IS AN
ACCREDITED INVESTOR (AS DEFINED IN RULE 501(a) UNDER THE SECURITIES ACT) IN A
TRANSACTION EXEMPT FROM THE REGISTRATION PROVISIONS OF THE SECURITIES ACT (UPON
PROVISION OF AN INVESTOR LETTER AVAILABLE FROM THE TRANSFER AGENT IN NEW YORK
CITY, AND, IF REQUESTED BY THE ISSUER, AN OPINION OF COUNSEL, EACH IN A FORM
SATISFACTORY TO THE ISSUER), IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE
SECURITIES LAW OF ANY STATE OF THE UNITED STATES. TERMS USED IN THIS LEGEND HAVE
THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

                  PECOM ENERGIA S.A., an Argentine corporation duly organized
and existing under the law of the Republic of Argentina (referred to herein as
the "Issuer"), for value received, hereby promises to pay to Cede & Co., or
registered assigns (the "Registered Holder"), upon surrender hereof the
principal sum of U.S. dollars [      ] (US$[      ]) or such amount as shall be
the outstanding principal amount hereof after (i) subtracting all prepayments of
principal made in respect of this [DTC Restricted][Regulation S] Global Note
pursuant to the terms set forth on the reverse hereof; (ii) subtracting the
aggregate principal amount of any Definitive Registered Global Securities
(capitalized terms used herein and not defined herein shall have the meaning
specified in the Indenture referred to below) that are part of the issue of
Securities of which this [DTC Restricted][Regulation S] Global Note is a part
(the "Applicable Tranche") and that are issued upon transfer of or in exchange
for a portion or portions hereof, (iii) subtracting the aggregate principal
amount by which the aggregate principal amount of the [DTC
Restricted][Regulation S] Global Note that is part of the Applicable Tranche is
increased following a transfer of a portion or portions hereto for a resulting
portion or portions of such [DTC Restricted][Regulation S] Global Note, (iv)
adding the aggregate principal amount by which the aggregate principal amount of
such [DTC Restricted][Regulation S] Global Note is decreased following a
transfer of a portion or portions of such [DTC Restricted][Regulation S] Global
Note for a resulting portion or portions hereof and (v) adding the aggregate
principal amount of any Definitive Registered Global Notes that are part of the
Applicable Tranche and that are canceled upon transfer or exchange for a
resulting portion or portions hereof on [ ], [       ], or on such earlier date
as the principal hereof may become due in accordance with the provisions hereof
(the "Maturity Date"). The Issuer further unconditionally promises to pay
interest in arrears on each Payment Date, beginning on [ ] 2002 and the Maturity
Date on any outstanding portion of the unpaid principal amount hereof at a rate
per annum determined in accordance with Section 2.2 on the reverse hereof and to
pay any Additional Amounts payable in accordance with the Indenture and the
Terms and Conditions of the Notes endorsed hereon (the "Terms and Conditions").
Interest shall accrue from and including the most recent date to which interest
has been paid or duly provided for, or, if no interest has been paid or duly
provided for, from [ ], [       ], until payment of said principal sum has been
made or duly provided for. This being a [DTC Restricted][Regulation S] Global
Note deposited with the Registered Holder, as holder of record of this [DTC
Restricted][Regulation S] Global Note, the Registered Holder shall

                                      A-2

<PAGE>

be entitled to receive payments of principal and interest by wire transfer of
immediately available Dollars, provided that principal and interest due at
maturity shall be paid only upon surrender hereof.

                  [The statements set forth in the restricted legend set forth
above are an integral part of the terms of this DTC Restricted Global Note and
by acceptance hereof each holder of this DTC Restricted Global Note agrees to be
subject to and bound by the terms and provisions set forth in such legend.]

                  This [DTC Restricted][Regulation S] Global Note is issued in
respect of an issue of US$[        ] aggregate principal amount of Notes of the
Issuer and is governed by the Amended and Restated Indenture (the "Base
Indenture") between the Issuer and The Bank of New York, as supplemented by the
[       ] Supplemental Indenture (the "Supplemental Indenture" and together with
the Base Indenture, the "Indenture") New York Office, as Trustee, and Securities
Registrar, the terms of which Indenture are incorporated herein by reference.
This [DTC Restricted][Regulation S] Global Note shall in all respects be
entitled to the same benefits as other Notes under the Indenture.

                  Upon any exchange or transfer of all or a portion of this [DTC
Restricted] [Regulation S] Global Note for Definitive Registered Notes or a
portion or portions of the [DTC Restricted][Regulation S] Global Note, or upon
any exchange or transfer of Definitive Registered Notes or a portion or portions
of the [DTC Restricted][Regulation S] Global Note for an interest in this [DTC
Restricted][Regulation S] Global Note, in accordance with the terms of the [DTC
Restricted][Regulation S] Global Note, this [DTC Restricted][Regulation S]
Global Note shall be endorsed to reflect the chance of the principal amount
evidenced hereby as provided for in the Indenture.

                  This Note constitutes an obligacion negociable under Argentine
Law No. 23,576, as amended (the "Negotiable Obligations Law"), and is entitled
to the benefits set forth therein and is subject to the procedural requirements
thereof. In the case of an occurrence of a default by the Issuer in the payment
of any amount due under this Note, the Holder of this Note is entitled to take
summary judicial proceedings (accion ejecutiva) in order to recover payment of
any such amount.

                  This Short Term Trade Series Note has been issued pursuant to
a resolution of an extraordinary meeting of shareholders of the Issuer passed on
April 8, 1998, and resolutions of the Board of Directors of the Issuer passed on
April 17, 1998 and September 18, 2002.

                  Unless the certificate of authentication hereon has been
executed by the Trustee by manual signature of one of its authorized officers,
this Note shall not be valid or obligatory for any purpose.

                  AS PROVIDED BY DECREE NO. 259/96, THE AMOUNTS PAYABLE PURSUANT
TO THIS SHORT TERM TRADE SERIES NOTE ARE PAYABLE TO THE REGISTERED HOLDER OR ITS
REGISTERED ASSIGNS AS RECORDED ON THE NOTE REGISTRAR KEPT BY THE SECURITY
REGISTRAR.

                                      A-3

<PAGE>

                  REFERENCE IS HEREBY MADE TO THE FURTHER PROVISIONS OF THIS
NOTE SET FORTH ON THE REVERSE HEREOF WHICH FURTHER PROVISIONS ARE INCORPORATED
BY REFERENCE IN THEIR ENTIRETY AND SHALL FOR ALL PURPOSES HAVE THE SAME EFFECT
AS IF SET FORTH AT THIS PLACE.

                                      A-4

<PAGE>

                  IN WITNESS WHEREOF, PECOM ENERGIA S.A. has caused this Note to
be duly executed.

Dated:                                      PECOM ENERGIA S.A.,

                                            By: ________________________________
                                                Name:
                                                Title: Director

                                            By: ________________________________
                                                Name:
                                                Title: Syndic

                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION

                  This is one of the Securities of the series designated therein
referred to in the within-mentioned Indenture.

                                            The Bank of New York, as Trustee,

                                            By: ________________________________
                                            Authorized Signatory

                                      A-5

<PAGE>

                                [REVERSE OF NOTE]

                              TERMS AND CONDITIONS

                  These Terms and Conditions (these "Terms") apply to and are
incorporated in this Short Term Trade Series Note which is one of the duly
authorized issue of Obligaciones Negociables (negotiable obligations,
hereinafter called the "Securities") of PECOM ENERGIA S.A., a sociedad anonima
organized under the laws of the Republic of Argentina (the "Issuer"), of the
series herein specified (Short Term Trade Series), all issued or to be issued
under and pursuant to an Amended and Restated Indenture (as in effect on the
date hereof, the "Base Indenture") dated as of August 1, 2002, duly executed and
delivered by the Issuer and [___________], as Trustee (herein called the
"Trustee") and as supplemented by the First Supplemental Indenture dated as of
October 4, 2002 (the "Short Term Trade Series Supplemental Indenture") (as the
Base Indenture may be amended or supplemented from time to time, including by
the Short Term Trade Series Supplemental Indenture, the "Indenture").

                  These Terms hereby incorporate by reference the provisions of
the Indenture as they relate to Short Term Trade Series Notes (including,
without limitation, in respect of the rights, limitations of rights,
obligations, duties and immunities thereunder of the Trustee and any agent of
the Trustee, any Short Term Trade Series Agent, the Issuer and the Short Term
Trade Series Holders and the terms upon which the Short Term Trade Series Notes
are issued and are to be authenticated and delivered). For all purposes of these
Terms and the Short Term Trade Series Notes, capitalized terms used herein (i)
which are defined herein shall have the meanings assigned thereto herein, and
(ii) which are not defined herein shall have the meanings assigned thereto in
the Indenture.

                  The Securities may be issued in one or more series, which
different series may be issued in various aggregate principal amounts, may
mature at different times, may bear interest (if any) at different rates, may be
subject to different redemption provisions (if any), may be subject to different
covenants and Events of Default as defined in the Base Indenture and may
otherwise vary as provided or permitted in the Indenture. This Short Term Trade
Series Note is one of the series of Securities of the Issuer issued pursuant to
the Indenture and designated as the Short Term Floating Rate Trade Series Notes
Due [__], 2003, limited in aggregate principal amount to [US______________].

                  No reference herein to the Indenture and no provision of this
Short Term Trade Series Note or of the Indenture shall alter or impair the
obligation of the Issuer, which is absolute and unconditional, to pay the
principal of, interest on and Additional Amounts, if any, with respect to this
Short Term Trade Series Note at the place, rate and respective times and in the
coin or currency herein and in the Indenture prescribed.

                  The Short Term Trade Series Notes are issuable in registered
form without coupons in denominations of US$[__________] and any integral
multiple of US$[_____]. This Short Term Trade Series Note may be exchanged for a
like aggregate principal amount of Short Term Trade Series Notes of other
authorized denominations at the office or agency of the Issuer in the City of
New York or in Buenos Aires, Argentina, designated for such purpose and in the
manner and subject to the limitations provided in the Indenture.

                                      A-6

<PAGE>

                  The Short Term Trade Series Notes shall constitute unsecured
and unsubordinated obligations of the Issuer and rank pari passu and without any
preference among themselves. The payment obligations of the Issuer under each
Short Term Trade Series Note, except as is or may be provided by Argentine law,
rank at least pari passu in priority of payment with all other present and
future unsecured and unsubordinated obligations of the Issuer from time to time
outstanding.

                  Upon due presentment for registration of transfer of this
Short Term Trade Series Note at the office or agency of the Issuer in the City
of New York or in Buenos Aires, Argentina designated for such purpose, a new
Short Term Trade Series Note or Short Term Trade Series Notes of authorized
denominations for a like aggregate principal amount will be issued to the
transferee in exchange therefor, subject to the limitations provided in the
Indenture. No charge shall be made for any such transfer or exchange, but the
Issuer may require payment of a sum sufficient to cover any tax or other
governmental charge imposed in connection therewith.

                  The Issuer, the Trustee and any agent of the Issuer or the
Trustee may treat the person in whose name this Short Term Trade Series Note is
registered as the owner hereof for all purposes, whether or not this Short Term
Trade Series Note is overdue, and none of the Issuer, the Trustee or any such
agent shall be affected by notice to the contrary.

                  A holder of a beneficial interest in this Global Security may,
by written notice to the Trustee, request that all or part of its interest in
this Global Security be exchanged for Definitive Securities, substantially in
the form of Exhibit B to the Short Term Trade Series Supplemental Indenture,
pursuant to Subsection 204(c)(iv) of the Base Indenture, and the Issuer will
execute and Trustee will authenticate such individual Securities pursuant to
Subsection 204(c)(v) of the Base Indenture. In addition, the Short Term Trade
Series Notes shall be issued in the form of Definitive Registered Securities
pursuant to the terms of Section 204(c)(i) in the Base Indenture.

                  The Indenture permits, with certain exceptions as therein
provided, the Issuer and the Trustee to enter into supplemental indentures to
the Indenture for the purpose of adding any provisions to or changing in any
manner or eliminating any of the provisions of the Indenture or of modifying in
any manner the rights of the Holders of the Securities of each series under the
Indenture with the consent of the Holders of not less than a majority in
aggregate principal amount of the Securities at the time Outstanding of each
series to be affected thereby on behalf of the Holders of all Securities of such
series. The Indenture also permits the Holders of a majority in aggregate
principal amount of the Securities at the time Outstanding of each series, on
behalf of the Holders of all Securities of such series, to waive compliance by
the Issuer with certain provisions of the Indenture and certain past defaults
and their consequences with respect to such series under the Indenture. Any such
consent or waiver by the Holder of this Short Term Trade Series Note shall be
conclusive and binding upon such Holder and upon all future Holders of this
Short Term Trade Series Note and of any Short Term Trade Series Notes issued
upon the registration of transfer hereof or in exchange herefor or in lieu
hereof, whether or not notation of such consent or waiver is made upon this
Short Term Trade Series Note or such other Short Term Trade Series Notes . In
addition, subject to certain exceptions set forth in the Indenture, without the
consent of any Holder, the Issuer and the Trustee may amend the Indenture or the
notes to make changes that do not adversely affect the rights of any Holder.

                                      A-7

<PAGE>

                  The following provisions shall apply to the Short Term Trade
Series Notes:

                  SECTION 1.  INTERPRETATION

                  For all purposes of these Terms and this Short Term Trade
Series Note:

                  1.1      All references herein to Sections, unless otherwise
specified, refer to the corresponding Sections of these Terms.

                  1.2      The terms "hereof", "herein", "hereby", "hereto",
"hereunder" and "herewith" refer to this Short Term Trade Series Note and these
Terms.

                  1.3      In accordance with the Indenture, any Short Term
Trade Series Note may be referred to as "Security".

                  1.4      Accounting Terms and Determinations

                  Unless otherwise specified herein, all accounting terms used
herein shall be interpreted, all accounting determinations hereunder shall be
made, and all financial statements required to be delivered hereunder shall be
prepared in accordance with Argentine GAAP, applied on a basis consistent
(except for changes concurred in by the Issuer's independent public accountants)
with the most recent audited consolidated financial statements of the Issuer and
its Subsidiaries delivered to the Short Term Trade Series Holders.

                  SECTION 2.  THE SHORT TERM TRADE SERIES NOTES

                  2.1      PRINCIPAL PAYMENT

                  The principal of the Short Term Trade Series Notes shall be
payable in full on the Maturity Date.

                  2.2      INTEREST RATES

                  2.2.1    Each Short Term Trade Series Note shall bear interest
on the outstanding principal amount thereof, for each day, other than a day
during an Alternate Rate Period, during the applicable Interest Period, at a
rate per annum equal to the Applicable LIBOR Rate applicable to such Interest
Period as determined by the Calculation Agent in accordance with the provisions
of the Indenture (including the definition of "LIBOR") which determination shall
be conclusive absent manifest error. The interest accrued in respect of each
Short Term Trade Series Note pursuant to this Section 2.2 as of each Payment
Date shall be payable on such Payment Date.

                  2.2.2    Each Short Term Trade Series Note shall bear interest
on the outstanding principal amount thereof, for each day that falls in any
Alternate Rate Period during any Interest Period, at a rate per annum equal to
the Alternative Basis Interest Rate as determined by the Calculation Agent in
accordance with the provisions of the Indenture.

                                      A-8

<PAGE>

                  2.2.3    Any overdue amount of Note Payments with respect to
the Short Term Trade Series Notes shall (without duplication of any amounts
payable under clauses 2.2.1 or 2.2.2 of this Section 2.2) bear interest, payable
on demand (such interest, "Default Interest"), (i) for each day, other than a
day during an Alternate Rate Period, until (and to the extent) Satisfied in
Cash, at a rate per annum equal to the sum of the Applicable LIBOR Rate then in
effect plus 2% and (ii) on and after the Maturity Date until such amount shall
be Satisfied in Cash in full at a rate per annum equal at all times to the sum
of (A) the Applicable LIBOR Rate computed for the period determined by the New
Notes Administrative Agent beginning with the Maturity Date and for successive
one-month periods as though each were an Interest Period plus (B) 2%.

                  2.2.4    (a) The initial Interest Period shall commence on the
date of the Takedown and shall end as provided in the definition of Interest
Period. Thereafter, each Interest Period shall commence as provided in the
definition of Interest Period and end on a Payment Date, provided that the last
Interest Period shall end on the Maturity Date.

                  (b)      Prior to the commencement of any Interest Period, the
Calculation Agent will notify the Issuer, the Trustee and the Short Term Trade
Series Holders of (i) the Applicable LIBOR Rate or Alternative Basis Interest
Rate for such Interest Period and (ii) the total aggregate amount of interest
payable on the next Payment Date.

                  2.2.5    The Calculation Agent shall determine the interest
rate applicable in respect of each Interest Period for each day during an
Alternate Rate Period in accordance with the following provisions:

                  (a)      upon delivery of an Alternate Rate Notice under
Section 2.6, the alternative basis for computing interest (the "Alternative
Basis Interest Rate"), which shall be payable in connection with such Interest
Period shall be the greater of (x) the Federal Funds Rate plus 0.5% or (y) the
Prime Rate, plus in each case the Applicable Margin; or

                  (b)      if the Alternate Rate Notice was delivered under
Section 2.6, then during the 30 days next succeeding the giving of an Alternate
Rate Notice, the Issuer and the Majority Holders shall negotiate in good faith
in order to arrive at a mutually satisfactory alternative basis for computing
interest (the "Alternative Basis Interest Rate"), which shall be payable in
connection with such Interest Period in order to compensate the Short Term Trade
Series Holders for the inadequate interest rate resulting from the occurrence of
the conditions specified in Section 2.6. If within such 30-day period, the
Issuer and the Majority Holders agree in writing upon the Alternative Basis
Interest Rate, such Alternative Basis Interest Rate shall be payable to all
Short Term Trade Series Holders in respect of their holdings of Short Term Trade
Series Notes from the commencement of, and only for, the duration of such
Interest Period. If the Issuer and the Majority Holders fail to agree upon such
Alternative Basis Interest Rate within such 30-day period, the Alternative Basis
Interest Rate in connection with such Interest Period payable to each Short Term
Trade Series Holder for such Interest Period shall be such Alternative Basis
Interest Rate as such Short Term Trade Series Holder shall determine (in a
certificate delivered by such Short Term Trade Series Holder to the Trustee
setting forth the basis of the computation of such amount, which certificate
shall be conclusive and binding for all purposes, absent manifest error) to be
necessary to compensate such Short Term Trade Series Holder for its cost of
obtaining (in good faith and using commercially reasonable efforts to

                                      A-9

<PAGE>

minimize the interest cost to the Issuer) as of the commencement of such
Interest Period funds for such Interest Period in an amount equal to the
principal amount of such Short Term Trade Series Holder's outstanding Short Term
Trade Series Notes plus the Applicable Margin. The Trustee shall notify the
Issuer and the Calculation Agent of each such determination as promptly as
practicable.

                  (c)      As the negotiations described in the preceding
subparagraph of this Section 2.2.5 and any resulting Alternative Basis Interest
Rate are intended for the direct benefit of the Short Term Trade Series Holders,
the Issuer expressly covenants and acknowledges (i) that as a result of any such
negotiations following the delivery of an Alternate Rate Notice under Section
2.6, the Short Term Trade Series Holders shall not receive a lower rate of
interest on the Short Term Trade Series Notes than the Short Term Trade Series
Holders would have received had there not been such negotiations, and (ii) that
such negotiations shall in no event cause, justify or give rise to any delay or
reduction in the payment of interest, principal or other amounts payable by the
Issuer under the Indenture or the Short Term Trade Series Notes.

                  (d)      The Calculation Agent shall give prompt written
notice to the Issuer, the Trustee and the Short Term Trade Series Holders of the
rate of interest so determined, and its determination thereof shall be prima
facie evidence thereof, absent manifest error.

                  2.3      REDEMPTION

                  2.3.1    OPTIONAL REDEMPTION

                  The Issuer may (a) upon at least three (3) Eurodollar Business
Days' irrevocable notice to the Administrative Agent, the Calculation Agent and
the Paying Agent, repay the Short Term Trade Series Notes outstanding on the
last day of any Interest Period, in whole or in part, at a redemption price of
100% of the principal amount thereof plus accrued and unpaid interest thereon to
the date of redemption plus all other accrued and unpaid amounts under the Note
Documents in respect of such Short Term Trade Series Notes, if any, (b) at any
time upon at least three (3) Eurodollar Business Days' irrevocable notice redeem
the Short Term Trade Series Notes in whole, or in part, at a redemption price of
100% of the principal amount thereof plus accrued and unpaid interest thereon to
the date of redemption plus LIBOR Funding Costs, if any, plus all other accrued
and unpaid amounts under the Note Documents in respect of such Short Term Trade
Series Notes (including without limitation, any Additional Amounts), if any, and
(c) redeem the Short Term Trade Series Notes at any time if required so to do in
order to comply with applicable law or if the Issuer would be required to pay
any Additional Amounts, at a redemption price of 100% of the principal amount
thereof plus accrued and unpaid interest thereon to the date of redemption plus
LIBOR Funding Costs, if any, plus all other accrued and unpaid amounts under the
Note Documents in respect of such Short Term Trade Series Notes (including,
without limitation, any Additional Amounts), if any; provided that each partial
prepayment shall be in respect of an aggregate principal amount of US$100,000 or
an integral multiple of US$1,000 in excess thereof and shall be made pro rata
among all Short Term Trade Series Holders in accordance with the respective
amounts owing to them. Each such prepayment hereunder shall be applied ratably
to prepay the remaining scheduled principal payments under the Short Term Trade
Series Notes in accordance with the respective amounts thereof.

                                      A-10

<PAGE>

                  2.3.2    MANDATORY REDEMPTION

                  2.3.2.1  The Issuer shall, on the first Payment Date that
occurs at least 120 days after the end of the fiscal year in which the Short
Term Trade Series Notes were issued, prepay an aggregate principal amount of the
Short Term Trade Series Notes in an amount equal to (a) 50% of the amount of
Excess Cash for such fiscal year multiplied by (b) a fraction, (i) the numerator
of which is equal to the aggregate outstanding principal amount of Short Term
Trade Series Notes immediately prior to such prepayment and (ii) the denominator
of which is the sum of:

                           (A)      the aggregate principal amount of all Letter
                  of Credit Advances outstanding under all Letter of Credit
                  Facilities and all New Notes in each case outstanding
                  immediately prior to any prepayment thereof from such Excess
                  Cash on such date, plus

                           (B)      the aggregate Available Amount of all
                  Letters of Credit outstanding under all Letter of Credit
                  Facilities immediately prior to any reduction thereof in
                  respect of such Excess Cash on such date, minus

                           (C)      the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such Excess Cash
                  on such date.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments (not including the Payment Date on which
such payment is made) under the Short Term Trade Series Notes.

                  2.3.2.2  The Issuer shall, on the first Payment Date occurring
at least 180 days after the date of any Asset Sale by the Issuer or any of its
Subsidiaries (excluding Asset Sales in the ordinary course of business), prepay
an aggregate principal amount of the Short Term Trade Series Notes in an amount
equal to (a) 100% of the Net Cash Proceeds from such Asset Sale less the sum of
the proceeds of such Asset Sale that shall have been used for Capital
Expenditures prior to such Payment Date as permitted by subsection (e) of the
Negative Covenants in Annex C and, if such Asset Sale consists of a Sale of
Ecuadorian Assets, the amount of Net Cash Proceeds of such Asset Sale required
to be applied in accordance with Section 2.04(j) of the Letter of Credit
Issuance and Reimbursement Agreement multiplied by (b) a fraction, (i) the
numerator of which is equal to the aggregate outstanding principal amount of
Short Term Trade Series Notes immediately prior to such prepayment and (ii) the
denominator of which is the sum of:

                           (A)      the aggregate principal amount of all Letter
                  of Credit Advances outstanding under all Letter of Credit
                  Facilities and all New Notes in each case outstanding
                  immediately prior to any prepayment thereof from such Net Cash
                  Proceeds on such date, plus

                                      A-11

<PAGE>

                           (B)      the aggregate Available Amount of all
                  Letters of Credit outstanding under all Letter of Credit
                  Facilities immediately prior to any reduction thereof in
                  respect of such Net Cash Proceeds on such date, minus

                           (C)      the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such Net Cash
                  Proceeds on such date.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments (not including the Payment Date on which
such payment is made) under the Short Term Trade Series Notes.

                  2.3.2.3  On any date on which the Issuer shall, at its option,
prepay, redeem, repurchase or in any manner defease or discharge any outstanding
principal amount of any Long Term New Notes or Long Term Debt prior to the
scheduled maturity thereof the Issuer shall prepay an aggregate principal amount
of the Short Term Trade Series Notes equal to the product of:

                  (a)      the aggregate principal amount of the Short Term
         Trade Series Notes outstanding at such time, multiplied by

                  (b)      a fraction of which:

                           (i)      the numerator is equal to the aggregate
                  principal amount of such Long Term New Notes or Long Term
                  Debt, as applicable, that is the subject of such prepayment or
                  discharge (in each case immediately prior thereto), and

                           (ii)     the denominator is equal to the aggregate
                  principal amount of such Long Term New Notes or such Long Term
                  Debt outstanding immediately prior to such prepayment or
                  discharge.

In the event that the Issuer shall, at any time, with respect to any Long Term
New Notes or Long Term Debt, enter into any amendment to, or in any other manner
cause any change or rescheduling of, the scheduled payments of principal with
respect to such Debt that would result in a shortening of the remaining average
life of any such Debt, any payment of principal of such Debt on any date shall
be treated as an optional prepayment of such Debt for purposes of this Section
2.3.2.3.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes.

                  2.3.2.4  Whenever the Issuer shall on any date make an
optional prepayment or redemption of any outstanding Long Term Letter of Credit
Advances under a Letter of Credit Facility prior to the scheduled maturity
thereof then the Issuer shall on the date of such prepayment or redemption,
prepay an aggregate principal amount of the Short Term Trade Series

                                      A-12

<PAGE>

Notes equal to the product of the aggregate principal amount of the Short Term
Trade Series Notes outstanding on such date, multiplied by a fraction:

                  (a)      the numerator of which is equal to the aggregate
         principal amount of such Long Term Letter of Credit Advances prepaid
         and

                  (b)      the denominator of which is equal to:

                           (i)      the aggregate principal amount of all Long
                  Term Letter of Credit Advances under such Letter of Credit
                  Facility and all Long Term MT Notes issued upon any Conversion
                  of Long Term Letter of Credit Advances made under such Letter
                  of Credit Facility outstanding immediately prior to such
                  prepayment and redemption, plus

                           (ii)     the aggregate Available Amounts of all
                  Letters of Credit issued under such Letter of Credit Facility
                  outstanding immediately prior to such prepayment and
                  redemption, minus

                           (iii)    the aggregate amount of cash and investments
                  thereof credited to the L/C Cash Collateral Account in respect
                  of such Letter of Credit Facility outstanding immediately
                  prior to such prepayment and redemption.

In the event that the Issuer shall, at any time, with respect to any Long Term
Letter of Credit Advances, enter into any amendment to, or in any manner cause
any change or rescheduling of, the scheduled payments of principal with respect
to such Debt that would result in a shortening of the remaining average life of
any such Debt, any payment of principal of such Debt on any date shall be
treated as an optional prepayment of such Debt for purposes of this Section
2.3.2.4.

Each such prepayment shall be applied ratably to prepay the remaining scheduled
principal payments under the Short Term Trade Series Notes.

                  2.3.2.5  The Issuer shall, on the first Business Day that
occurs at least 50 days after the end of each fiscal quarter of the Issuer,
prepay the aggregate outstanding principal amount of the Short Term Trade Series
Notes in an amount equal to 50% of the New Debt Amount with respect to such
fiscal quarter multiplied by a fraction:

                  (a)      the numerator of which is equal to the aggregate
         principal amount of the Short Term Trade Series Notes outstanding
         immediately prior to any prepayment pursuant to this subsection, and

                  (b)      the denominator of which is equal to

                           (i)      the aggregate principal amount of the New
                  Notes, outstanding immediately prior to any prepayment thereof
                  in respect of such New Debt Amount, plus

                                      A-13

<PAGE>

                           (ii)     the aggregate principal amount of all Letter
                  of Credit Advances outstanding under all Letter of Credit
                  Facilities immediately prior to any prepayment thereof in
                  respect of such New Debt Amount, plus

                           (iii)    the aggregate Available Amount of all
                  Letters of Credit outstanding under all Letter of Credit
                  Facilities immediately prior to any reduction thereof in
                  respect of such New Debt Amount, minus

                           (iv)     the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such New Debt
                  Amount.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes.

                  2.3.2.6  On any date on which the Issuer shall at its option
make any deposit to any L/C Collateral Account pledged in favor of the Lenders
under any Letter of Credit Facility, at a time when no such deposit would
otherwise be required pursuant to the Letter of Credit Issuance and
Reimbursement Agreement, the Issuer shall, on the date of such deposit, prepay
an aggregate principal amount of the Short Term Trade Series Notes in an amount
equal to (a) the aggregate principal amount of the Short Term Trade Series Notes
outstanding on such date, multiplied by (b) a fraction:

                  (A)      the numerator of which is equal to the aggregate
         amount of cash so deposited into such L/C Cash Collateral Account in
         respect of such Letter of Credit Facility on such date, and

                  (B)      the denominator of which is equal to:

                           (I)      the aggregate principal amount of all Letter
                                    of Credit Advances outstanding under such
                                    Letter of Credit Facilities and New Notes
                                    issued upon any Conversion of Letter of
                                    Credit Advances made under such Letter of
                                    Credit Facility outstanding immediately
                                    prior to such deposit, plus

                           (II)     the aggregate Available Amount of all
                                    Letters of Credit outstanding under such
                                    Letter of Credit Facility immediately prior
                                    to such deposit, minus

                           (III)    the aggregate amount of cash and investments
                                    thereof credited to such L/C Collateral
                                    Account immediately prior to such deposit.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes
in accordance with the respective amounts thereof.

                                      A-14

<PAGE>

                  2.3.2.7  On any date on which the Issuer shall at its option
reduce the Available Amount of any Letter of Credit issued under any Letter of
Credit Facility by either (a) causing a new letter of credit for which the
Issuer or one or more of its Subsidiaries is the account party to be issued
other than under the Letter of Credit Issuance and Reimbursement Agreement or
(b) having the Issuer or one or more of its Subsidiaries create, assume, incur
or suffer to exist a Lien on cash or financial assets for the benefit of, or
contribute cash or financial assets to, the beneficiary thereof, at a time when
no such reduction would otherwise be required pursuant to the Letter of Credit
Issuance and Reimbursement Agreement, the Issuer shall prepay an aggregate
principal amount of the Short Term Trade Series Notes in an amount equal to (i)
the aggregate principal amount of the Short Term Trade Series Notes outstanding
at such date, multiplied by (ii) a fraction:

                  (A)      the numerator of which is equal to the aggregate
         reductions of such Available Amounts in respect of such Letter of
         Credit issued under such Letter of Credit Facility, and

                  (B)      the denominator of which is equal to:

                           (I)      the aggregate principal amount of all Letter
                                    of Credit Advances outstanding under such
                                    Letter of Credit Facility and the New Notes
                                    issued upon any Conversion of Letter of
                                    Credit Advances made under such Letter of
                                    Credit Facility, in each case outstanding
                                    immediately prior to such reduction, plus

                           (II)     the aggregate Available Amount of all
                                    Letters of Credit outstanding under such
                                    Letter of Credit Facility immediately prior
                                    to such reduction, minus

                           (III)    the aggregate amount of cash and investments
                                    thereof credited to the L/C Collateral
                                    Account in respect of such Letter of Credit
                                    Facility outstanding immediately prior to
                                    such reduction.

Each such prepayment shall be applied ratably to prepay the remaining scheduled
principal payments under the Short Term Trade Series Notes in accordance with
the respective amounts thereof.

                  2.3.2.8  The Issuer shall not on any date prior to the
Maturity Date thereof prepay, repurchase or in any manner defease or discharge
any principal amount of any Short Term Letter of Credit Advance, Short Term MT
Note or Short Term New Note (the "Prepaid Debt") unless otherwise required under
Section 2.04 of the Letter of Credit Issuance and Reimbursement Agreement or
under Section 2.4.2 of any Supplemental Indenture pursuant to which Short Term
New Notes are issued, or unless on the same date it shall have:

                  (A)      in the case of Short Term New Notes (other than Short
         Term MT Notes), other than any of the same constituting Prepaid Debt
         ("Other Short Term New Notes"), prepaid a principal amount thereof, and

                                      A-15

<PAGE>

                  (B)      in the case of Short Term L/C Facilities, other than
         any thereof in respect of the Prepaid Debt ( "Other Short Term L/C
         Facilities"), at its option:

                           (I)      prepaid the principal amount of Short Term
                  Letter of Credit Advances and Short Term MT Notes in respect
                  of such Letter of Credit Facilities,

                           (II)     reduced the Available Amount of Letters of
                  Credit issued under such Short Term L/C Facilities and/or

                           (III)    deposited cash into L/C Collateral Accounts
                  in respect of such Short Term L/C Facilities,

so that the aggregate amount of such prepayments and, if applicable, reductions
and deposits, as a percentage of:

                  (a)      in the case of each other series of Other Short Term
         New Notes, the aggregate principal amount of such series of Other Short
         Term New Notes then outstanding, and

                  (b)      in the case of each Other Short Term L/C Facilities,
         the total Available Amount of Letters of Credit issued and principal
         amount of Letter of Credit Advances and Short Term MT Notes outstanding
         in respect of such Other Short Term L/C Facility, minus the value of
         cash and investments on deposit in the L/C Collateral Account in
         respect of such Other Short Term L/C Facility,

is the same as the percentage of the prepaid principal amount of Prepaid Debt is
of

                  (i)      if such Prepaid Debt is Short Term New Notes, the
         principal amount of such series of Short Term New Notes then
         outstanding,

                  (ii)     if such Prepaid Debt is in respect of a Short Term
         L/C Facility, the total Available Amount of all Letters of Credit
         issued and the aggregate principal amount of Letter of Credit Advances
         and MT Notes in respect of such Short Term L/C Facility, minus the
         value of cash and investments on deposit in the L/C Collateral Account
         in respect of the Short Term L/C Facility.

In the event that the Issuer shall, at any time, with respect to any Short Term
Letter of Credit Advances, Short Term MT Notes or Short Term New Notes, enter
into any amendment to, or in any other manner cause any change or rescheduling
of, the scheduled payments of principal with respect to such Debt that would
result in a shortening of the remaining average life of any such Debt, any
payment of principal of such Debt on any date shall be treated as an optional
prepayment of such Debt for purposes of this Section 2.3.2.8.

                  Each prepayment under this Section 2.3.2 shall be made pro
rata among all Short Term Trade Series Holders in accordance with the respective
amounts owing to them. All prepayments under this Section 2.3.2 shall be made
together with accrued interest to the date of

                                      A-16

<PAGE>

such prepayment on the principal amount prepaid and any Additional Amounts,
LIBOR Funding Costs or other amounts due hereunder.

                  2.4      GENERAL PROVISIONS AS TO PAYMENTS

                  2.4.1    The Issuer shall make each payment of principal of,
and interest on, the Short Term Trade Series Notes and of fees and other amounts
payable hereunder, not later than 3:00 p.m. (New York City time) on the date
when due, in immediately available funds in Dollars in New York City, to The
Bank of New York, the Paying Agent, at [        ], Attn: [        ]. The Paying
Agent will promptly distribute to each Short Term Trade Series Holder its
ratable share of each such payment received by the Paying Agent for the account
of the Short Term Trade Series Holders. Whenever any payment of principal of, or
interest on, the Short Term Trade Series Notes shall be due on a day which is
not a Eurodollar Business Day, the date for payment thereof shall be extended to
the immediately succeeding Eurodollar Business Day unless such Eurodollar
Business Day falls in another calendar month, in which case the date for payment
thereof shall be the immediately preceding Eurodollar Business Day. If the date
for any payment of principal is extended by operation of law or otherwise,
interest thereon shall be payable for such extended time.

                  2.4.2    Notwithstanding the provisions of this Section 2.4,
upon written notice to the Issuer and the Trustee by any Short Term Trade Series
Note Holder that a payment to it by the Issuer hereunder be made in Argentina,
such payment shall be made for the benefit of such Short Term Trade Series Note
Holder to the Argentine Paying Agent, in which event the provisions of Sections
2.4.1 relating to the Paying Agent shall apply mutatis mutandi to the Argentine
Paying Agent.

                  2.4.3    The Bank of New York shall be the initial Paying
Agent, and Banco Rio de la Plata S.A. shall be the initial Argentine Paying
Agent, for the Short Term Trade Series Notes. The consent of the Majority
Holders and the Issuer shall be required for the appointment of any successor in
such capacities in respect of the Short Term Trade Series Notes.

                  2.4.4    It is understood and agreed by the parties hereto
that, for all purposes of this Short Term Trade Series Supplemental Indenture
and the other Note Documents, the Issuer may satisfy its payment obligations
with respect to the Short Term Trade Series Notes by making payments in Cash to
the Paying Agent or, if applicable pursuant to Section 2.4.2, the Argentine
Paying Agent, for the benefit of the party to whom any such payment is due and
for the application thereof pursuant to the terms of the Indenture, and the
Issuer's payment obligations hereunder with respect to the Short Term Trade
Series Notes (i) may only be Satisfied in Cash, and (ii) shall be deemed
satisfied and discharged only and to the extent Satisfied in Cash.

                  2.5      COMPUTATION OF INTEREST

                  All interest hereunder shall be computed on the basis of a
year of 360 days and paid for the actual number of days elapsed (including the
first day but excluding the last day). Notwithstanding the foregoing, during
each Alternate Rate Period, for each day that the Alternative Basis Interest
Rate is determined by reference to the rate applicable pursuant to Section
2.2.5(a) and the Alternative Basis Interest Rate is based upon the Prime Rate as

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<PAGE>

contemplated therein, interest shall be computed on the basis of a year of 365
or 366 days, as the case may be, and paid for the actual number of days elapsed
(including the first day but excluding the last day). The applicable interest
rate for any Interest Period or Alternate Rate Period will be calculated by the
Calculation Agent in accordance with the provisions hereof and will be reported
to the Trustee, the Paying Agent and the Argentine Paying Agent, as an amount of
Dollars payable per U.S.$1,000 principal amount of Short Term Trade Series Notes
at least 3 days prior to the applicable Payment Date.

                  2.6      LIBOR DISRUPTION

                  If (a) on or prior to the first day of any Interest Period the
Calculation Agent reasonably determines (which determination shall be conclusive
absent manifest error) that adequate and reasonable means do not exist for
ascertaining the LIBOR for such Interest Period, or (b) on or prior to the first
day of any Interest Period the Majority Holders advise the Calculation Agent
that the LIBOR for such Interest Period will not adequately and fairly reflect
the cost to such Short Term Trade Series Holders of purchasing and holding their
Short Term Trade Series Notes during such Interest Period, the Calculation Agent
shall forthwith give notice thereof (an "Alternate Rate Notice") in respect of
such Interest Period to the Issuer, the Trustee and the Short Term Trade Series
Holders, whereupon until the Calculation Agent gives notice (an "Alternate Rate
Rescission Notice") to the Issuer, the Trustee and the Short Term Trade Series
Holders that each circumstance giving rise to such Alternate Rate Notice no
longer exists (it being understood that the Calculation Agent will give such
notice reasonably promptly after it has knowledge that such circumstances have
ceased to exist), the interest rate applicable to the Short Term Trade Series
Notes shall be determined pursuant to Section 2.2.5.

                  2.7      ADDITIONAL AMOUNTS - TAXES

                  In addition to the provisions of the Base Indenture, and, to
the extent in conflict herewith, notwithstanding such provisions, the Issuer
agrees that any and all payments by the Issuer hereunder shall be made, free and
clear of, and without withholding or deduction for or on account of, any Taxes,
excluding, (i) in the case of each Short Term Trade Series Holder, New Notes
Administrative Agent, Paying Agent or Argentine Paying Agent, Taxes that are
imposed on its overall net income (and franchise taxes imposed in lieu thereof)
by any state or foreign jurisdiction under the laws of which such Short Term
Trade Series Holder, New Notes Administrative Agent, Paying Agent or Argentine
Paying Agent, as the case may be, is organized, or any political subdivision
thereof, and (ii) in the case of each Short Term Trade Series Holder, Taxes that
are imposed on its overall net income (and franchise taxes imposed in lieu
thereof) by the state or foreign jurisdiction of its Holding Office or any
political subdivision thereof (all such nonexcluded Taxes in respect of payments
hereunder collectively, "Indemnifiable Taxes"). If any Indemnifiable Taxes are
required to be withheld or deducted from any such payment, the Issuer shall pay
such additional amounts as may be necessary to ensure that the amounts received
by each Short Term Trade Series Holder, New Notes Administrative Agent, Paying
Agent or Argentine Paying Agent (as the case may be) after such withholding or
deduction (and after withholding or deduction on amounts payable under this
Section 2.7) shall equal the respective amounts that would have been receivable
from the Issuer (any such additional amounts required to be paid by the Issuer,
"Additional Amounts").

                                      A-18

<PAGE>

                  The Issuer shall promptly pay when due any present or future
stamp, court or documentary taxes or any other excise or property taxes, charges
or similar levies (including the Personal Property Tax) that arise in any
jurisdiction from any payment made hereunder or from the execution, delivery,
enforcement or registration of this Agreement or any other document or
instrument referred to herein or therein (collectively, "Other Taxes").

                  The Issuer agrees to indemnify each Short Term Trade Series
Holder, New Notes Administrative Agent, Paying Agent or Argentine Paying Agent
for the full amount of Indemnifiable Taxes and Other Taxes, and for the full
amount of taxes of any kind imposed or asserted by any jurisdiction on amounts
payable under this Section 2.7, imposed on or paid by any such Short Term Trade
Series Holder, the New Notes Administrative Agent, the Paying Agent or Argentine
Paying Agent, as the case may be, and any liability (including penalties,
additions to tax interest and expenses) arising therefrom or with respect
thereto. Amounts payable by the Issuer under the indemnity set forth in this
paragraph shall be paid within 30 days from the date on which the applicable
Short Term Trade Series Holder, New Notes Administrative Agent, Paying Agent or
Argentine Paying Agent, as the case may be, makes written demand therefor.

                  Within 30 days after the date of any payment of Taxes under
this Section 2.7, the Issuer will notify the Administrative Agent of such
payment and, at the request of the Administrative Agent, furnish to the
Administrative Agent at its address referred to in Section 9.2 of the
Supplemental Indenture, the original or a certified copy of a receipt evidencing
payment thereof. Upon request, the Issuer shall provide the Administrative Agent
with documentation reasonably satisfactory to the Administrative Agent
evidencing the payment of any Additional Amounts. Copies of such documentation
shall be made available by the Administrative Agent to the Short Term Trade
Series Holders upon request.

                  2.8      ILLEGALITY

                  Notwithstanding any other provision of this Short Term Trade
Series Supplemental Indenture, if any Short Term Trade Series Holder shall
notify the Short Term Trade Series Administrative Agent that the introduction of
or any change in or in the interpretation of an law or regulation makes it
unlawful, or any central bank or other Governmental Authority asserts that it is
unlawful, for such Short Term Trade Series Holder or its Holding Office to
purchase, own, hold or maintain its Short Term Trade Series Note (after such
Short Term Trade Series Holder used such reasonable efforts to transfer its
Short Term Trade Series Notes if such transfer will avoid illegality and shall
not, in the sole judgment of such Short Term Trade Series Holder, be
disadvantageous (economically or otherwise) to such Short Term Trade Series
Holder) the Issuer shall promptly redeem the Short Term Trade Series Note(s)
held by such Short Term Trade Series Holder by paying the principal amount to be
redeemed, together with accrued interest thereon to the date of redemption,
together with any amounts payable pursuant to Section 2.9 in respect of such
redemption.

                  2.9      YIELD PROTECTION

                  If, for any reason, the Issuer makes any payment of principal
with respect to any Short Term Trade Series Note on any day other than the last
day of the Interest Period then

                                      A-19

<PAGE>

applicable thereto, the Issuer shall, promptly upon demand, reimburse each Short
Term Trade Series Holder for any LIBOR Funding Costs incurred by such Short Term
Trade Series Holder of such amount prepaid, provided that such Short Term Trade
Series Holder shall have delivered to the Issuer a certificate as to the amount
of such loss or expense, which certificate shall be conclusive and binding for
all purposes, absent manifest error.

                  2.10     INCREASED COSTS AND REDUCED RETURN

                  2.10.1   If, on or after the date hereof, the adoption of any
applicable law, rule or regulation, or any change in any applicable law, rule or
regulation, or any change in the interpretation or administration thereof by any
Governmental Authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by any Short Term Trade
Series Holder (or its Holding Office) with any request or directive (whether or
not having the force of law) of any such authority, central bank or comparable
agency, (i) shall subject any Short Term Trade Series Holder (or its Holding
Office) to any tax, duty or other charge with respect to one or more of its
Short Term Trade Series Notes, or shall change the basis of taxation of payments
to any Short Term Trade Series Holder (or its Holding Office) of the principal
of or interest on its Short Term Trade Series Notes or any other amounts due
under this Indenture or any Short Term Trade Series Notes, except for the
introduction of, or changes in the rate of, tax on the overall net income of
such Short Term Trade Series Holder (or its Holding Office), or franchise taxes,
imposed by the jurisdiction (or any political subdivision or taxing authority
thereof) under the laws of which such Short Term Trade Series Holder is
organized (or in which such Short Term Trade Series Holder's Holding Office is
located); or (ii) shall impose, modify or deem applicable any reserve
(including, without limitation, any such requirement imposed by the Board of
Governors of the Federal Reserve System and minimum reserve requirements of the
European Central Bank but excluding any such requirement included in an
applicable Eurodollar Reserve Percentage), special deposit, insurance assessment
or similar requirement against assets of, deposits with or for the account of,
or credit extended by, any Short Term Trade Series Holder (or its Holding
Office) or shall impose on any Short Term Trade Series Holder (or its Holding
Office) or the London interbank market any other condition affecting the
purchasing, owning, holding or maintaining of any one or more Short Term Trade
Series Notes by such Short Term Trade Series Holder (or its Holding Office) and
the result of any of the foregoing is to increase the cost to such Short Term
Trade Series Holder (or its Holding Office or any holding company of which such
Short Term Trade Series Holder is a subsidiary) of purchasing, owning, holding
or maintaining any one or more of its Short Term Trade Series Notes, or to
reduce the amount of any sum received or receivable by such Short Term Trade
Series Holder (or its Holding Office) under the Indenture and any one or more of
its Short Term Trade Series Notes, by an amount deemed by such Short Term Trade
Series Holder to be material (excluding, for purposes of this Section 2.10.1 any
increased costs or any reductions resulting from any Indemnifiable Taxes or
Other Taxes payable by the Issuer pursuant to Section 2.7), then, promptly upon
demand by such Short Term Trade Series Holder (with a copy to the New Notes
Administrative Agent and the Calculation Agent), which demand shall be
accompanied by a certificate of such Short Term Trade Series Holder setting
forth in reasonable detail the circumstances which give rise to such increase or
reduction, the amount of the claim and the calculation thereof (and which
certificate shall be conclusive and binding for all purposes, absent manifest
error), the Issuer shall, to the extent that it shall not have done so under

                                      A-20

<PAGE>

any other provision of the Indenture, pay to such Short Term Trade Series Holder
such additional amount or amounts as will, without duplication, compensate such
Short Term Trade Series Holder (or any holding company of which such Short Term
Trade Series Holder is a subsidiary) for such increased cost or reduction.

                  2.10.2   If, on or after the date hereof, any Short Term Trade
Series Holder shall determine that the adoption of any applicable law, rule or
regulation regarding capital adequacy, or any change in any such law, rule or
regulation, or any change in the interpretation or administration thereof by any
Governmental Authority, central bank or comparable agency charged with the
interpretation or administration thereof, or any request or directive regarding
capital adequacy (whether or not having the force of law) of any such authority,
central bank or comparable agency, has the effect of reducing the rate of return
on capital of any Short Term Trade Series Holder (or any holding company of
which such Short Term Trade Series Holder is a subsidiary) as a consequence of
such Short Term Trade Series Holder's purchasing, owning, maintaining or holding
any Short Term Trade Series Notes to a level below that which such Short Term
Trade Series Holder (or its Holding Office or any holding company of which such
Short Term Trade Series Holder is a subsidiary) could have achieved but for such
adoption, change, request or directive (taking into consideration its policies
with respect to capital adequacy) by an amount deemed by such Short Term Trade
Series Holder to be material, then from time to time, promptly upon demand by
such Short Term Trade Series Holder (with a copy to the New Notes Administrative
Agent), which demand shall be accompanied by a certificate of such Short Term
Trade Series Holder setting forth in reasonable detail the circumstances which
give rise to such reduction, the amount of the claim and the calculation thereof
(and which certificate shall be conclusive and binding for all purposes, absent
manifest error), the Issuer shall, to the extent that it shall not have already
done so under any other provision of the Indenture, pay to such Short Term Trade
Series Holder such additional amount or amounts as will, without duplication,
compensate such Short Term Trade Series Holder or its Holding Office (or any
holding company of which such Short Term Trade Series Holder is a subsidiary)
for such reduction.

                  Each Short Term Trade Series Holder will promptly notify the
Issuer, the New Notes Administrative Agent and the Calculation Agent of any
event of which it has knowledge, occurring after the date hereof, which will
entitle such Short Term Trade Series Holder to compensation pursuant to this
Section 2.10. Each Short Term Trade Series Holder will, before requesting
compensation for additional amounts pursuant to this Section 2.10), use
reasonable efforts (consistent with its internal policy and legal and regulatory
restrictions) to minimize or eliminate the requirement of such compensation by
transferring its Short Term Trade Series Notes to a different Holding Office or
otherwise if such transfer or other action will avoid or reduce the need for
compensation for such additional amounts and will not, in the sole judgment of
such Short Term Trade Series Holder, be otherwise disadvantageous (economically
or otherwise) to such Short Term Trade Series Holder; provided that no Short
Term Trade Series Holder shall have any obligation to provide any information as
to any possible actions or designations considered and taken or rejected by such
Short Term Trade Series Holder or the reasons therefore. A certificate of any
Short Term Trade Series Holder claiming compensation under this Section 2.10)
and setting forth the additional amount or amounts to be paid to it hereunder
shall be conclusive and binding for all purposes, absent manifest error.

                                      A-21

<PAGE>

                  SECTION 3.        COVENANTS

                  In addition to the covenants contained in Articles Eight and
Ten of the Base Indenture, the Issuer agrees that, so long as any amount payable
under any Short Term Trade Series Note remains unpaid, it will comply with the
covenants set forth in Sections 3.1 through 3.5 of the Short Term Trade Series
Supplemental Indenture and the terms and covenants set forth in Annex C to the
Short Term Trade Series Supplemental Indenture under the terms and conditions
set forth therein.

                  SECTION 4.        REPRESENTATIONS AND WARRANTIES

                  The representations and warranties set forth in Annex B to the
Short Term Trade Series Supplemental Indenture under the terms and conditions
set forth therein are incorporated herein by reference.

                  SECTION 5.        GOVERNING LAW

                  This Short Term Trade Series Note shall be governed by and
construed and interpreted in accordance with the law of the State of New York;
provided that all matters relating to the due authorization, execution, issuance
and delivery of the Short Term Trade Series Notes by the Issuer, the approval
thereof by the CNV for the offering of the Short Term Trade Series Notes to the
public in Argentina and matters relating to the legal requirements necessary for
the Short Term Trade Series Notes to qualify as obligaciones negociables under
Argentine law shall be governed by the Negotiable Obligations Law and other
applicable Argentine laws and regulations.

                                      A-22

<PAGE>

                                                                       EXHIBIT B

                               TO SHORT TERM TRADE SERIES SUPPLEMENTAL INDENTURE

          [FORM OF SHORT TERM FLOATING RATE TRADE SERIES NOTE DUE 2003]

                            [FORM OF DEFINITIVE NOTE]

CUSIP NO.: [      ]

                               PECOM ENERGIA S.A.

                  Incorporated in Argentina as a sociedad anonima (a corporation
with limited liability) on November 6, 1946, having legal domicile at Maipu 1,
Buenos Aires, Argentina registered with the Public Registry of Commerce
(Registro Publico del Comercio) on November 17, 1947 under No. 759, Folio 569,
Book 47, Volume A of the Estatutos Nacionales, with a term expiring on June 18,
2046.

             [SHORT TERM FLOATING RATE TRADE SERIES NOTES, DUE 2003]

Registered                                  Principal Amount: US$[___],000,000

No. ______                                                 ISIN: _____________

                                                       Common Code: __________

                                                           CUSIP: ____________

                  Pecom Energia S.A., a sociedad anonima organized, existing and
incorporated under the laws of to Republic of Argentina (herein called the
"Issuer", which term includes any successor Person under the Indenture), for
value received, hereby promises to pay to [_____] (the "Registered Holder" or
"Holder") or registered assigns, the principal sum of [______] United States
dollars (US $[___],000,000) in the City of New York, or, but only upon prior
request of the Registered Holder, in Buenos Aires, Argentina, in either case on
the dates and in the amounts specified in the Short Term Trade Series
Supplemental Indenture in 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, and, in accordance with the applicable provisions of the Terms
and Conditions (the "Terms and Conditions") set forth on the reverse of this
Note (capitalized terms used but not defined herein shall have the respective
meanings assigned thereto in the Terms and Conditions). The Issuer further
unconditionally promises to pay interest in arrears on each Payment Date,
beginning on [ ], 2002 and the Maturity Date on any outstanding portion of the
unpaid principal amount hereof at a rate per annum determined in accordance with
Section 2.2 on the reverse hereof and to pay any Additional Amounts payable in
accordance with the Indenture and the Terms and Conditions of the Notes endorsed
hereon (the "Terms and

                                      B-1

<PAGE>

Conditions"). Interest shall accrue from and including the most recent date to
which interest has been paid or duly provided for, or, if no interest has been
paid or duly provided for, from [       ], [       ], until payment of said
principal sum has been made or duly provided for. The interest so payable, and
punctually paid or duly provided for, on any Payment Date will, except as
provided in the Terms and Conditions, be paid by wire transfer of immediately
available funds to the Registered Holder in whose name this Note (or one or more
predecessor Short Term Trade Series Notes) is registered at the close of
business on the third Business Day next preceding such Payment Date (each a
"Regular Record Date"). Any such interest which is payable, but is not so
punctually paid or duly provided for, shall forthwith cease to be payable to the
registered Holder on such Regular Record Date and may be paid either to the
person in whose name this Note (or one or more predecessor Short Term Trade
Series Notes) is registered at the close of business on a Special Record Date
for the payment of such interest to be fixed by the Trustee, notice whereof
shall be given to Holders of Short Term Trade Series Notes not less than ten
days prior to such Special Record Date, or may be paid at any time in any other
lawful manner not inconsistent with the requirements of any securities exchange
on which the Short Term Trade Series Notes may be listed, and upon such notice
as may be required by such exchange, if such manner of payment shall be deemed
practicable by the Trustee, all as more fully provided in the Indenture.
Notwithstanding the foregoing, in the case of interest payable at the Maturity
Date, such interest shall be paid to the same Person to whom the principal
hereof is payable. Principal of this Note will be payable by transfer to a U.S.
Dollar account maintained by the registered Holder with a bank located in New
York City in accordance with wire transfer instructions provided by the
registered Holder.

                  This Definitive Note is issued in respect of an issue of US$[
] aggregate principal amount of Notes of the Issuer and is governed by the
Amended and Restated Indenture (the "Base Indenture") between the Issuer and The
Bank of New York, as supplemented by the [       ] Supplemental Indenture (the
"Supplemental Indenture" and together with the Base Indenture, the "Indenture")
New York Office, as Trustee, and Securities Registrar, the terms of which
Indenture are incorporated herein by reference. This Definitive Note shall in
all respects be entitled to the same benefits as other Notes under the
Indenture.

                  This Note constitutes an obligacion negociable under Argentine
Law No. 23,576, as amended (the "Negotiable Obligations Law"), and is entitled
to the benefits set forth therein and is subject to the procedural requirements
thereof. In the case of an occurrence of a default by the Issuer in the payment
of any amount due under this Note, the Holder of this Note is entitled to take
summary judicial proceedings (accion ejecutiva) in order to recover payment of
any such amount.

                  This Short Term Trade Series Note has been issued pursuant to
a resolution of an extraordinary meeting of shareholders of the Issuer passed on
April 8, 1998, and resolutions of the Board of Directors of the Issuer passed on
April 17, 1998 and September 18, 2002.

                  Unless the certificate of authentication hereon has been
executed by the Trustee by manual signature of one of its authorized officers,
this Note shall not be valid or obligatory for any purpose.

                                      B-2

<PAGE>

                  AS PROVIDED BY DECREE NO. 259/96, THE AMOUNTS PAYABLE PURSUANT
TO THIS SHORT TERM TRADE SERIES NOTE ARE PAYABLE TO THE REGISTERED HOLDER OR ITS
REGISTERED ASSIGNS AS RECORDED ON THE NOTE REGISTRAR KEPT BY THE SECURITY
REGISTRAR.

                  REFERENCE IS HEREBY MADE TO THE FURTHER PROVISIONS OF THIS
NOTE SET FORTH ON THE REVERSE HEREOF WHICH FURTHER PROVISIONS ARE INCORPORATED
BY REFERENCE IN THEIR ENTIRETY AND SHALL FOR ALL PURPOSES HAVE THE SAME EFFECT
AS IF SET FORTH AT THIS PLACE.

                                      B-3

<PAGE>

                  IN WITNESS WHEREOF, PECOM ENERGIA S.A. has caused this Note to
be duly executed.

Dated:                                      PECOM ENERGIA S.A.,

                                            By: ________________________________
                                                Name:
                                                Title: Director

                                            By: ________________________________
                                                Name:
                                                Title:  Syndic

                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION

                  This is one of the Securities of the series designated therein
referred to in the within-mentioned Indenture.

                                            The Bank of New York, as Trustee,

                                            By: ________________________________
                                                      AUTHORIZED SIGNATORY

                                      B-4

<PAGE>

                                [REVERSE OF NOTE]

                              TERMS AND CONDITIONS

                  These Terms and Conditions (these "Terms") apply to and are
incorporated in this Short Term Trade Series Note which is one of the duly
authorized issue of Obligaciones Negociables (negotiable obligations,
hereinafter called the "Securities") of PECOM ENERGIA S.A., a sociedad anonima
organized under the laws of the Republic of Argentina (the "Issuer"), of the
series herein specified (Short Term Trade Series), all issued or to be issued
under and pursuant to an Amended and Restated Indenture (as in effect on the
date hereof, the "Base Indenture") dated as of August 1, 2002, duly executed and
delivered by the Issuer and [___________], as Trustee (herein called the
"Trustee") and as supplemented by the First Supplemental Indenture dated as of
October 4, 2002 (the "Short Term Trade Series Supplemental Indenture") (as the
Base Indenture may be amended or supplemented from time to time, including by
the Short Term Trade Series Supplemental Indenture, the "Indenture").

                  These Terms hereby incorporate by reference the provisions of
the Indenture as they relate to Short Term Trade Series Notes (including,
without limitation, in respect of the rights, limitations of rights,
obligations, duties and immunities thereunder of the Trustee and any agent of
the Trustee, any Short Term Trade Series Agent, the Issuer and the Short Term
Trade Series Holders and the terms upon which the Short Term Trade Series Notes
are issued and are to be authenticated and delivered). For all purposes of these
Terms and the Short Term Trade Series Notes, capitalized terms used herein (i)
which are defined herein shall have the meanings assigned thereto herein, and
(ii) which are not defined herein shall have the meanings assigned thereto in
the Indenture.

                  The Securities may be issued in one or more series, which
different series may be issued in various aggregate principal amounts, may
mature at different times, may bear interest (if any) at different rates, may be
subject to different redemption provisions (if any), may be subject to different
covenants and Events of Default as defined in the Base Indenture and may
otherwise vary as provided or permitted in the Indenture. This Short Term Trade
Series Note is one of the series of Securities of the Issuer issued pursuant to
the Indenture and designated as the Short Term Floating Rate Trade Series Notes
Due [__], 2003, limited in aggregate principal amount to [US______________].

                  No reference herein to the Indenture and no provision of this
Short Term Trade Series Note or of the Indenture shall alter or impair the
obligation of the Issuer, which is absolute and unconditional, to pay the
principal of, interest on and Additional Amounts, if any, with respect to this
Short Term Trade Series Note at the place, rate and respective times and in the
coin or currency herein and in the Indenture prescribed.

                  The Short Term Trade Series Notes are issuable in registered
form without coupons in denominations of US$[__________] and any integral
multiple of US$[_____]. This Short Term Trade Series Note may be exchanged for a
like aggregate principal amount of Short Term Trade Series Notes of other
authorized denominations at the office or agency of the Issuer in the City of
New York or in Buenos Aires, Argentina, designated for such purpose and in the
manner and subject to the limitations provided in the Indenture.

                                      B-5

<PAGE>

                  The Short Term Trade Series Notes shall constitute unsecured
and unsubordinated obligations of the Issuer and rank pari passu and without any
preference among themselves. The payment obligations of the Issuer under each
Short Term Trade Series Note, except as is or may be provided by Argentine law,
rank at least pari passu in priority of payment with all other present and
future unsecured and unsubordinated obligations of the Issuer from time to time
outstanding.

                  Upon due presentment for registration of transfer of this
Short Term Trade Series Note at the office or agency of the Issuer in the City
of New York or in Buenos Aires, Argentina designated for such purpose, a new
Short Term Trade Series Note or Short Term Trade Series Notes of authorized
denominations for a like aggregate principal amount will be issued to the
transferee in exchange therefor, subject to the limitations provided in the
Indenture. No charge shall be made for any such transfer or exchange, but the
Issuer may require payment of a sum sufficient to cover any tax or other
governmental charge imposed in connection therewith.

                  The Issuer, the Trustee and any agent of the Issuer or the
Trustee may treat the person in whose name this Short Term Trade Series Note is
registered as the owner hereof for all purposes, whether or not this Short Term
Trade Series Note is overdue, and none of the Issuer, the Trustee or any such
agent shall be affected by notice to the contrary.

                  The Indenture permits, with certain exceptions as therein
provided, the Issuer and the Trustee to enter into supplemental indentures to
the Indenture for the purpose of adding any provisions to or changing in any
manner or eliminating any of the provisions of the Indenture or of modifying in
any manner the rights of the Holders of the Securities of each series under the
Indenture with the consent of the Holders of not less than a majority in
aggregate principal amount of the Securities at the time Outstanding of each
series to be affected thereby on behalf of the Holders of all Securities of such
series. The Indenture also permits the Holders of a majority in aggregate
principal amount of the Securities at the time Outstanding of each series, on
behalf of the Holders of all Securities of such series, to waive compliance by
the Issuer with certain provisions of the Indenture and certain past defaults
and their consequences with respect to such series under the Indenture. Any such
consent or waiver by the Holder of this Short Term Trade Series Note shall be
conclusive and binding upon such Holder and upon all future Holders of this
Short Term Trade Series Note and of any Short Term Trade Series Notes issued
upon the registration of transfer hereof or in exchange herefor or in lieu
hereof, whether or not notation of such consent or waiver is made upon this
Short Term Trade Series Note or such other Short Term Trade Series Notes . In
addition, subject to certain exceptions set forth in the Indenture, without the
consent of any Holder, the Issuer and the Trustee may amend the Indenture or the
notes to make changes that do not adversely affect the rights of any Holder.

                  The following provisions shall apply to the Short Term Trade
Series Notes:

                  SECTION 1.  INTERPRETATION

                  For all purposes of these Terms and this Short Term Trade
Series Note:

                  1.1      All references herein to Sections, unless otherwise
specified, refer to the corresponding Sections of these Terms.

                                      B-6

<PAGE>

                  1.2      The terms "hereof", "herein", "hereby", "hereto",
"hereunder" and "herewith" refer to this Short Term Trade Series Note and these
Terms.

                  1.3      In accordance with the Indenture, any Short Term
Trade Series Note may be referred to as "Security".

                  1.4      Accounting Terms and Determinations

                  Unless otherwise specified herein, all accounting terms used
herein shall be interpreted, all accounting determinations hereunder shall be
made, and all financial statements required to be delivered hereunder shall be
prepared in accordance with Argentine GAAP, applied on a basis consistent
(except for changes concurred in by the Issuer's independent public accountants)
with the most recent audited consolidated financial statements of the Issuer and
its Subsidiaries delivered to the Short Term Trade Series Holders.

                  SECTION 2.  THE SHORT TERM TRADE SERIES NOTES

                  2.1      PRINCIPAL PAYMENT

                  The principal of the Short Term Trade Series Notes shall be
payable in full on the Maturity Date.

                  2.2      INTEREST RATES

                  2.2.1    Each Short Term Trade Series Note shall bear interest
on the outstanding principal amount thereof, for each day, other than a day
during an Alternate Rate Period, during the applicable Interest Period, at a
rate per annum equal to the Applicable LIBOR Rate applicable to such Interest
Period as determined by the Calculation Agent in accordance with the provisions
of the Indenture (including the definition of "LIBOR") which determination shall
be conclusive absent manifest error. The interest accrued in respect of each
Short Term Trade Series Note pursuant to this Section 2.2 as of each Payment
Date shall be payable on such Payment Date.

                  2.2.2    Each Short Term Trade Series Note shall bear interest
on the outstanding principal amount thereof, for each day that falls in any
Alternate Rate Period during any Interest Period, at a rate per annum equal to
the Alternative Basis Interest Rate as determined by the Calculation Agent in
accordance with the provisions of the Indenture.

                  2.2.3    Any overdue amount of Note Payments with respect to
the Short Term Trade Series Notes shall (without duplication of any amounts
payable under clauses 2.2.1 or 2.2.2 of this Section 2.2) bear interest, payable
on demand (such interest, "Default Interest"), (i) for each day, other than a
day during an Alternate Rate Period, until (and to the extent) Satisfied in
Cash, at a rate per annum equal to the sum of the Applicable LIBOR Rate then in
effect plus 2% and (ii) on and after the Maturity Date until such amount shall
be Satisfied in Cash in full at a rate per annum equal at all times to the sum
of (A) the Applicable LIBOR Rate computed for the period determined by the New
Notes Administrative Agent beginning with the Maturity Date and for successive
one-month periods as though each were an Interest Period plus (B) 2%.

                                      B-7

<PAGE>

                  2.2.4    (a) The initial Interest Period shall commence on the
date of the Takedown and shall end as provided in the definition of Interest
Period. Thereafter, each Interest Period shall commence as provided in the
definition of Interest Period and end on a Payment Date, provided that the last
Interest Period shall end on the Maturity Date.

                  (b)      Prior to the commencement of any Interest Period, the
Calculation Agent will notify the Issuer, the Trustee and the Short Term Trade
Series Holders of (i) the Applicable LIBOR Rate or Alternative Basis Interest
Rate for such Interest Period and (ii) the total aggregate amount of interest
payable on the next Payment Date.

                  2.2.5    The Calculation Agent shall determine the interest
rate applicable in respect of each Interest Period for each day during an
Alternate Rate Period in accordance with the following provisions:

                  (a)      upon delivery of an Alternate Rate Notice under
Section 2.6, the alternative basis for computing interest (the "Alternative
Basis Interest Rate"), which shall be payable in connection with such Interest
Period shall be the greater of (x) the Federal Funds Rate plus 0.5% or (y) the
Prime Rate, plus in each case the Applicable Margin; or

                  (b)      if the Alternate Rate Notice was delivered under
Section 2.6, then during the 30 days next succeeding the giving of an Alternate
Rate Notice, the Issuer and the Majority Holders shall negotiate in good faith
in order to arrive at a mutually satisfactory alternative basis for computing
interest (the "Alternative Basis Interest Rate"), which shall be payable in
connection with such Interest Period in order to compensate the Short Term Trade
Series Holders for the inadequate interest rate resulting from the occurrence of
the conditions specified in Section 2.6. If within such 30-day period, the
Issuer and the Majority Holders agree in writing upon the Alternative Basis
Interest Rate, such Alternative Basis Interest Rate shall be payable to all
Short Term Trade Series Holders in respect of their holdings of Short Term Trade
Series Notes from the commencement of, and only for, the duration of such
Interest Period. If the Issuer and the Majority Holders fail to agree upon such
Alternative Basis Interest Rate within such 30-day period, the Alternative Basis
Interest Rate in connection with such Interest Period payable to each Short Term
Trade Series Holder for such Interest Period shall be such Alternative Basis
Interest Rate as such Short Term Trade Series Holder shall determine (in a
certificate delivered by such Short Term Trade Series Holder to the Trustee
setting forth the basis of the computation of such amount, which certificate
shall be conclusive and binding for all purposes, absent manifest error) to be
necessary to compensate such Short Term Trade Series Holder for its cost of
obtaining (in good faith and using commercially reasonable efforts to minimize
the interest cost to the Issuer) as of the commencement of such Interest Period
funds for such Interest Period in an amount equal to the principal amount of
such Short Term Trade Series Holder's outstanding Short Term Trade Series Notes
plus the Applicable Margin. The Trustee shall notify the Issuer and the
Calculation Agent of each such determination as promptly as practicable.

                  (c)      As the negotiations described in the preceding
subparagraph of this Section 2.2.5 and any resulting Alternative Basis Interest
Rate are intended for the direct benefit of the Short Term Trade Series Holders,
the Issuer expressly covenants and acknowledges (i) that as a result of any such
negotiations following the delivery of an Alternate Rate Notice under

                                      B-8

<PAGE>

Section 2.6, the Short Term Trade Series Holders shall not receive a lower rate
of interest on the Short Term Trade Series Notes than the Short Term Trade
Series Holders would have received had there not been such negotiations, and
(ii) that such negotiations shall in no event cause, justify or give rise to any
delay or reduction in the payment of interest, principal or other amounts
payable by the Issuer under the Indenture or the Short Term Trade Series Notes.

                  (d)      The Calculation Agent shall give prompt written
notice to the Issuer, the Trustee and the Short Term Trade Series Holders of the
rate of interest so determined, and its determination thereof shall be prima
facie evidence thereof, absent manifest error.

                  2.3      REDEMPTION

                  2.3.1    OPTIONAL REDEMPTION

                  The Issuer may (a) upon at least three (3) Eurodollar Business
Days' irrevocable notice to the Administrative Agent, the Calculation Agent and
the Paying Agent, repay the Short Term Trade Series Notes outstanding on the
last day of any Interest Period, in whole or in part, at a redemption price of
100% of the principal amount thereof plus accrued and unpaid interest thereon to
the date of redemption plus all other accrued and unpaid amounts under the Note
Documents in respect of such Short Term Trade Series Notes, if any, (b) at any
time upon at least three (3) Eurodollar Business Days' irrevocable notice redeem
the Short Term Trade Series Notes in whole, or in part, at a redemption price of
100% of the principal amount thereof plus accrued and unpaid interest thereon to
the date of redemption plus LIBOR Funding Costs, if any, plus all other accrued
and unpaid amounts under the Note Documents in respect of such Short Term Trade
Series Notes (including without limitation, any Additional Amounts), if any, and
(c) redeem the Short Term Trade Series Notes at any time if required so to do in
order to comply with applicable law or if the Issuer would be required to pay
any Additional Amounts, at a redemption price of 100% of the principal amount
thereof plus accrued and unpaid interest thereon to the date of redemption plus
LIBOR Funding Costs, if any, plus all other accrued and unpaid amounts under the
Note Documents in respect of such Short Term Trade Series Notes (including,
without limitation, any Additional Amounts), if any; provided that each partial
prepayment shall be in respect of an aggregate principal amount of US$100,000 or
an integral multiple of US$1,000 in excess thereof and shall be made pro rata
among all Short Term Trade Series Holders in accordance with the respective
amounts owing to them. Each such prepayment hereunder shall be applied ratably
to prepay the remaining scheduled principal payments under the Short Term Trade
Series Notes in accordance with the respective amounts thereof.

                  2.3.2    MANDATORY REDEMPTION

                  2.3.2.1  The Issuer shall, on the first Payment Date that
occurs at least 120 days after the end of the fiscal year in which the Short
Term Trade Series Notes were issued, prepay an aggregate principal amount of the
Short Term Trade Series Notes in an amount equal to (a) 50% of the amount of
Excess Cash for such fiscal year multiplied by (b) a fraction, (i) the numerator
of which is equal to the aggregate outstanding principal amount of Short Term
Trade Series Notes immediately prior to such prepayment and (ii) the denominator
of which is the sum of:

                                      B-9

<PAGE>

                           (A)      the aggregate principal amount of all Letter
                  of Credit Advances outstanding under all Letter of Credit
                  Facilities and all New Notes in each case outstanding
                  immediately prior to any prepayment thereof from such Excess
                  Cash on such date, plus

                           (B)      the aggregate Available Amount of all
                  Letters of Credit outstanding under all Letter of Credit
                  Facilities immediately prior to any reduction thereof in
                  respect of such Excess Cash on such date, minus

                           (C)      the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such Excess Cash
                  on such date.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments (not including the Payment Date on which
such payment is made) under the Short Term Trade Series Notes.

                  2.3.2.2  The Issuer shall, on the first Payment Date occurring
at least 180 days after the date of any Asset Sale by the Issuer or any of its
Subsidiaries (excluding Asset Sales in the ordinary course of business), prepay
an aggregate principal amount of the Short Term Trade Series Notes in an amount
equal to (a) 100% of the Net Cash Proceeds from such Asset Sale less the sum of
the proceeds of such Asset Sale that shall have been used for Capital
Expenditures prior to such Payment Date as permitted by subsection (e) of the
Negative Covenants in Annex C and, if such Asset Sale consists of a Sale of
Ecuadorian Assets, the amount of Net Cash Proceeds of such Asset Sale required
to be applied in accordance with Section 2.04(j) of the Letter of Credit
Issuance and Reimbursement Agreement multiplied by (b) a fraction, (i) the
numerator of which is equal to the aggregate outstanding principal amount of
Short Term Trade Series Notes immediately prior to such prepayment and (ii) the
denominator of which is the sum of:

                           (A)      the aggregate principal amount of all Letter
                  of Credit Advances outstanding under all Letter of Credit
                  Facilities and all New Notes in each case outstanding
                  immediately prior to any prepayment thereof from such Net Cash
                  Proceeds on such date, plus

                           (B)      the aggregate Available Amount of all
                  Letters of Credit outstanding under all Letter of Credit
                  Facilities immediately prior to any reduction thereof in
                  respect of such Net Cash Proceeds on such date, minus

                           (C)      the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such Net Cash
                  Proceeds on such date.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments (not including the Payment Date on which
such payment is made) under the Short Term Trade Series Notes.

                                      B-10

<PAGE>

                  2.3.2.3  On any date on which the Issuer shall, at its option,
prepay, redeem, repurchase or in any manner defease or discharge any outstanding
principal amount of any Long Term New Notes or Long Term Debt prior to the
scheduled maturity thereof the Issuer shall prepay an aggregate principal amount
of the Short Term Trade Series Notes equal to the product of:

                  (a)      the aggregate principal amount of the Short Term
         Trade Series Notes outstanding at such time, multiplied by

                  (b)      a fraction of which:

                           (i)      the numerator is equal to the aggregate
                  principal amount of such Long Term New Notes or Long Term
                  Debt, as applicable, that is the subject of such prepayment or
                  discharge (in each case immediately prior thereto), and

                           (ii)     the denominator is equal to the aggregate
                  principal amount of such Long Term New Notes or such Long Term
                  Debt outstanding immediately prior to such prepayment or
                  discharge.

In the event that the Issuer shall, at any time, with respect to any Long Term
New Notes or Long Term Debt, enter into any amendment to, or in any other manner
cause any change or rescheduling of, the scheduled payments of principal with
respect to such Debt that would result in a shortening of the remaining average
life of any such Debt, any payment of principal of such Debt on any date shall
be treated as an optional prepayment of such Debt for purposes of this Section
2.3.2.3.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes.

                  2.3.2.4  Whenever the Issuer shall on any date make an
optional prepayment or redemption of any outstanding Long Term Letter of Credit
Advances under a Letter of Credit Facility prior to the scheduled maturity
thereof then the Issuer shall on the date of such prepayment or redemption,
prepay an aggregate principal amount of the Short Term Trade Series Notes equal
to the product of the aggregate principal amount of the Short Term Trade Series
Notes outstanding on such date, multiplied by a fraction:

                  (a)      the numerator of which is equal to the aggregate
         principal amount of such Long Term Letter of Credit Advances prepaid
         and

                  (b)      the denominator of which is equal to:

                           (i)      the aggregate principal amount of all Long
         Term Letter of Credit Advances under such Letter of Credit Facility and
         all Long Term MT Notes issued upon any Conversion of Long Term Letter
         of Credit Advances made under such Letter of Credit Facility
         outstanding immediately prior to such prepayment and redemption, plus

                                      B-11

<PAGE>

                           (ii)     the aggregate Available Amounts of all
         Letters of Credit issued under such Letter of Credit Facility
         outstanding immediately prior to such prepayment and redemption, minus

                           (iii)    the aggregate amount of cash and investments
         thereof credited to the L/C Cash Collateral Account in respect of such
         Letter of Credit Facility outstanding immediately prior to such
         prepayment and redemption.

In the event that the Issuer shall, at any time, with respect to any Long Term
Letter of Credit Advances, enter into any amendment to, or in any manner cause
any change or rescheduling of, the scheduled payments of principal with respect
to such Debt that would result in a shortening of the remaining average life of
any such Debt, any payment of principal of such Debt on any date shall be
treated as an optional prepayment of such Debt for purposes of this Section
2.3.2.4.

Each such prepayment shall be applied ratably to prepay the remaining scheduled
principal payments under the Short Term Trade Series Notes.

                  2.3.2.5  The Issuer shall, on the first Business Day that
occurs at least 50 days after the end of each fiscal quarter of the Issuer,
prepay the aggregate outstanding principal amount of the Short Term Trade Series
Notes in an amount equal to 50% of the New Debt Amount with respect to such
fiscal quarter multiplied by a fraction:

                  (a)      the numerator of which is equal to the aggregate
         principal amount of the Short Term Trade Series Notes outstanding
         immediately prior to any prepayment pursuant to this subsection, and

                  (b)      the denominator of which is equal to

                           (i)      the aggregate principal amount of the New
                  Notes, outstanding immediately prior to any prepayment thereof
                  in respect of such New Debt Amount, plus

                           (ii)     the aggregate principal amount of all Letter
                  of Credit Advances outstanding under all Letter of Credit
                  Facilities immediately prior to any prepayment thereof in
                  respect of such New Debt Amount, plus

                           (iii)    the aggregate Available Amount of all
                  Letters of Credit outstanding under all Letter of Credit
                  Facilities immediately prior to any reduction thereof in
                  respect of such New Debt Amount, minus

                           (iv)     the aggregate amount of cash and investments
                  thereof credited to the L/C Collateral Accounts in respect of
                  all Letter of Credit Facilities immediately prior to any
                  deposits made to such accounts in respect of such New Debt
                  Amount.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes.

                                      B-12

<PAGE>

                  2.3.2.6  On any date on which the Issuer shall at its option
make any deposit to any L/C Collateral Account pledged in favor of the Lenders
under any Letter of Credit Facility, at a time when no such deposit would
otherwise be required pursuant to the Letter of Credit Issuance and
Reimbursement Agreement, the Issuer shall, on the date of such deposit, prepay
an aggregate principal amount of the Short Term Trade Series Notes in an amount
equal to (a) the aggregate principal amount of the Short Term Trade Series Notes
outstanding on such date, multiplied by (b) a fraction:

                  (A)      the numerator of which is equal to the aggregate
         amount of cash so deposited into such L/C Cash Collateral Account in
         respect of such Letter of Credit Facility on such date, and

                  (B)      the denominator of which is equal to:

                           (I)      the aggregate principal amount of all Letter
                                    of Credit Advances outstanding under such
                                    Letter of Credit Facilities and New Notes
                                    issued upon any Conversion of Letter of
                                    Credit Advances made under such Letter of
                                    Credit Facility outstanding immediately
                                    prior to such deposit, plus

                           (II)     the aggregate Available Amount of all
                                    Letters of Credit outstanding under such
                                    Letter of Credit Facility immediately prior
                                    to such deposit, minus

                           (III)    the aggregate amount of cash and investments
                                    thereof credited to such L/C Collateral
                                    Account immediately prior to such deposit.

Each such prepayment shall be applied ratably to reduce the amount of the
remaining scheduled principal payments under the Short Term Trade Series Notes
in accordance with the respective amounts thereof.

                  2.3.2.7  On any date on which the Issuer shall at its option
reduce the Available Amount of any Letter of Credit issued under any Letter of
Credit Facility by either (a) causing a new letter of credit for which the
Issuer or one or more of its Subsidiaries is the account party to be issued
other than under the Letter of Credit Issuance and Reimbursement Agreement or
(b) having the Issuer or one or more of its Subsidiaries create, assume, incur
or suffer to exist a Lien on cash or financial assets for the benefit of, or
contribute cash or financial assets to, the beneficiary thereof, at a time when
no such reduction would otherwise be required pursuant to the Letter of Credit
Issuance and Reimbursement Agreement, the Issuer shall prepay an aggregate
principal amount of the Short Term Trade Series Notes in an amount equal to (i)
the aggregate principal amount of the Short Term Trade Series Notes outstanding
at such date, multiplied by (ii) a fraction:

                  (A)      the numerator of which is equal to the aggregate
         reductions of such Available Amounts in respect of such Letter of
         Credit issued under such Letter of Credit Facility, and

                                      B-13

<PAGE>

                  (B)      the denominator of which is equal to:

                           (I)      the aggregate principal amount of all Letter
                                    of Credit Advances outstanding under such
                                    Letter of Credit Facility and the New Notes
                                    issued upon any Conversion of Letter of
                                    Credit Advances made under such Letter of
                                    Credit Facility, in each case outstanding
                                    immediately prior to such reduction, plus

                           (II)     the aggregate Available Amount of all
                                    Letters of Credit outstanding under such
                                    Letter of Credit Facility immediately prior
                                    to such reduction, minus

                           (III)    the aggregate amount of cash and investments
                                    thereof credited to the L/C Collateral
                                    Account in respect of such Letter of Credit
                                    Facility outstanding immediately prior to
                                    such reduction.

Each such prepayment shall be applied ratably to prepay the remaining scheduled
principal payments under the Short Term Trade Series Notes in accordance with
the respective amounts thereof.

                  2.3.2.8  The Issuer shall not on any date prior to the
Maturity Date thereof prepay, repurchase or in any manner defease or discharge
any principal amount of any Short Term Letter of Credit Advance, Short Term MT
Note or Short Term New Note (the "Prepaid Debt") unless otherwise required under
Section 2.04 of the Letter of Credit Issuance and Reimbursement Agreement or
under Section 2.4.2 of any Supplemental Indenture pursuant to which Short Term
New Notes are issued, or unless on the same date it shall have:

                  (A)      in the case of Short Term New Notes (other than Short
         Term MT Notes), other than any of the same constituting Prepaid Debt
         ("Other Short Term New Notes"), prepaid a principal amount thereof, and

                  (B)      in the case of Short Term L/C Facilities, other than
         any thereof in respect of the Prepaid Debt ( "Other Short Term L/C
         Facilities"), at its option:

                           (I)      prepaid the principal amount of Short Term
                  Letter of Credit Advances and Short Term MT Notes in respect
                  of such Letter of Credit Facilities,

                           (II)     reduced the Available Amount of Letters of
                  Credit issued under such Short Term L/C Facilities and/or

                           (III)    deposited cash into L/C Collateral Accounts
                  in respect of such Short Term L/C Facilities,

so that the aggregate amount of such prepayments and, if applicable, reductions
and deposits, as a percentage of:

                                      B-14

<PAGE>

                  (a)      in the case of each other series of Other Short Term
         New Notes, the aggregate principal amount of such series of Other Short
         Term New Notes then outstanding, and

                  (b)      in the case of each Other Short Term L/C Facilities,
         the total Available Amount of Letters of Credit issued and principal
         amount of Letter of Credit Advances and Short Term MT Notes outstanding
         in respect of such Other Short Term L/C Facility, minus the value of
         cash and investments on deposit in the L/C Collateral Account in
         respect of such Other Short Term L/C Facility,

is the same as the percentage of the prepaid principal amount of Prepaid Debt is
of

                  (i)      if such Prepaid Debt is Short Term New Notes, the
         principal amount of such series of Short Term New Notes then
         outstanding,

                  (ii)     if such Prepaid Debt is in respect of a Short Term
         L/C Facility, the total Available Amount of all Letters of Credit
         issued and the aggregate principal amount of Letter of Credit Advances
         and MT Notes in respect of such Short Term L/C Facility, minus the
         value of cash and investments on deposit in the L/C Collateral Account
         in respect of the Short Term L/C Facility.

In the event that the Issuer shall, at any time, with respect to any Short Term
Letter of Credit Advances, Short Term MT Notes or Short Term New Notes, enter
into any amendment to, or in any other manner cause any change or rescheduling
of, the scheduled payments of principal with respect to such Debt that would
result in a shortening of the remaining average life of any such Debt, any
payment of principal of such Debt on any date shall be treated as an optional
prepayment of such Debt for purposes of this Section 2.3.2.8.

                  Each prepayment under this Section 2.3.2 shall be made pro
rata among all Short Term Trade Series Holders in accordance with the respective
amounts owing to them. All prepayments under this Section 2.3.2 shall be made
together with accrued interest to the date of such prepayment on the principal
amount prepaid and any Additional Amounts, LIBOR Funding Costs or other amounts
due hereunder.

                  2.4      GENERAL PROVISIONS AS TO PAYMENTS

                  2.4.1    The Issuer shall make each payment of principal of,
and interest on, the Short Term Trade Series Notes and of fees and other amounts
payable hereunder, not later than 3:00 p.m. (New York City time) on the date
when due, in immediately available funds in Dollars in New York City, to The
Bank of New York, the Paying Agent, at [       ], Attn: [         ]. The Paying
Agent will promptly distribute to each Short Term Trade Series Holder its
ratable share of each such payment received by the Paying Agent for the account
of the Short Term Trade Series Holders. Whenever any payment of principal of, or
interest on, the Short Term Trade Series Notes shall be due on a day which is
not a Eurodollar Business Day, the date for payment

                                      B-15

<PAGE>

thereof shall be extended to the immediately succeeding Eurodollar Business Day
unless such Eurodollar Business Day falls in another calendar month, in which
case the date for payment thereof shall be the immediately preceding Eurodollar
Business Day. If the date for any payment of principal is extended by operation
of law or otherwise, interest thereon shall be payable for such extended time.

                  2.4.2    Notwithstanding the provisions of this Section 2.4,
upon written notice to the Issuer and the Trustee by any Short Term Trade Series
Note Holder that a payment to it by the Issuer hereunder be made in Argentina,
such payment shall be made for the benefit of such Short Term Trade Series Note
Holder to the Argentine Paying Agent, in which event the provisions of Sections
2.4.1 relating to the Paying Agent shall apply mutatis mutandi to the Argentine
Paying Agent.

                  2.4.3    The Bank of New York shall be the initial Paying
Agent, and Banco Rio de la Plata S.A. shall be the initial Argentine Paying
Agent, for the Short Term Trade Series Notes. The consent of the Majority
Holders and the Issuer shall be required for the appointment of any successor in
such capacities in respect of the Short Term Trade Series Notes.

                  2.4.4    It is understood and agreed by the parties hereto
that, for all purposes of this Short Term Trade Series Supplemental Indenture
and the other Note Documents, the Issuer may satisfy its payment obligations
with respect to the Short Term Trade Series Notes by making payments in Cash to
the Paying Agent or, if applicable pursuant to Section 2.4.2, the Argentine
Paying Agent, for the benefit of the party to whom any such payment is due and
for the application thereof pursuant to the terms of the Indenture, and the
Issuer's payment obligations hereunder with respect to the Short Term Trade
Series Notes (i) may only be Satisfied in Cash, and (ii) shall be deemed
satisfied and discharged only and to the extent Satisfied in Cash.

                  2.5      COMPUTATION OF INTEREST

                  All interest hereunder shall be computed on the basis of a
year of 360 days and paid for the actual number of days elapsed (including the
first day but excluding the last day). Notwithstanding the foregoing, during
each Alternate Rate Period, for each day that the Alternative Basis Interest
Rate is determined by reference to the rate applicable pursuant to Section
2.2.5(a) and the Alternative Basis Interest Rate is based upon the Prime Rate as
contemplated therein, interest shall be computed on the basis of a year of 365
or 366 days, as the case may be, and paid for the actual number of days elapsed
(including the first day but excluding the last day). The applicable interest
rate for any Interest Period or Alternate Rate Period will be calculated by the
Calculation Agent in accordance with the provisions hereof and will be reported
to the Trustee, the Paying Agent and the Argentine Paying Agent, as an amount of
Dollars payable per U.S.$1,000 principal amount of Short Term Trade Series Notes
at least 3 days prior to the applicable Payment Date.

                  2.6      LIBOR DISRUPTION

                  If (a) on or prior to the first day of any Interest Period the
Calculation Agent reasonably determines (which determination shall be conclusive
absent manifest error) that adequate and reasonable means do not exist for
ascertaining the LIBOR for such Interest Period, or (b) on or prior to the first
day of any Interest Period the Majority Holders advise the Calculation Agent
that the LIBOR for such Interest Period will not adequately and fairly reflect

                                      B-16

<PAGE>

the cost to such Short Term Trade Series Holders of purchasing and holding their
Short Term Trade Series Notes during such Interest Period, the Calculation Agent
shall forthwith give notice thereof (an "Alternate Rate Notice") in respect of
such Interest Period to the Issuer, the Trustee and the Short Term Trade Series
Holders, whereupon until the Calculation Agent gives notice (an "Alternate Rate
Rescission Notice") to the Issuer, the Trustee and the Short Term Trade Series
Holders that each circumstance giving rise to such Alternate Rate Notice no
longer exists (it being understood that the Calculation Agent will give such
notice reasonably promptly after it has knowledge that such circumstances have
ceased to exist), the interest rate applicable to the Short Term Trade Series
Notes shall be determined pursuant to Section 2.2.5.

                  2.7      ADDITIONAL AMOUNTS - TAXES

                  In addition to the provisions of the Base Indenture, and, to
the extent in conflict herewith, notwithstanding such provisions, the Issuer
agrees that any and all payments by the Issuer hereunder shall be made, free and
clear of, and without withholding or deduction for or on account of, any Taxes,
excluding, (i) in the case of each Short Term Trade Series Holder, New Notes
Administrative Agent, Paying Agent or Argentine Paying Agent, Taxes that are
imposed on its overall net income (and franchise taxes imposed in lieu thereof)
by any state or foreign jurisdiction under the laws of which such Short Term
Trade Series Holder, New Notes Administrative Agent, Paying Agent or Argentine
Paying Agent, as the case may be, is organized, or any political subdivision
thereof, and (ii) in the case of each Short Term Trade Series Holder, Taxes that
are imposed on its overall net income (and franchise taxes imposed in lieu
thereof) by the state or foreign jurisdiction of its Holding Office or any
political subdivision thereof (all such nonexcluded Taxes in respect of payments
hereunder collectively, "Indemnifiable Taxes"). If any Indemnifiable Taxes are
required to be withheld or deducted from any such payment, the Issuer shall pay
such additional amounts as may be necessary to ensure that the amounts received
by each Short Term Trade Series Holder, New Notes Administrative Agent, Paying
Agent or Argentine Paying Agent (as the case may be) after such withholding or
deduction (and after withholding or deduction on amounts payable under this
Section 2.7) shall equal the respective amounts that would have been receivable
from the Issuer (any such additional amounts required to be paid by the Issuer,
"Additional Amounts").

                  The Issuer shall promptly pay when due any present or future
stamp, court or documentary taxes or any other excise or property taxes, charges
or similar levies (including the Personal Property Tax) that arise in any
jurisdiction from any payment made hereunder or from the execution, delivery,
enforcement or registration of this Agreement or any other document or
instrument referred to herein or therein (collectively, "Other Taxes").

                  The Issuer agrees to indemnify each Short Term Trade Series
Holder, New Notes Administrative Agent, Paying Agent or Argentine Paying Agent
for the full amount of Indemnifiable Taxes and Other Taxes, and for the full
amount of taxes of any kind imposed or asserted by any jurisdiction on amounts
payable under this Section 2.7, imposed on or paid by any such Short Term Trade
Series Holder, the New Notes Administrative Agent, the Paying Agent or Argentine
Paying Agent, as the case may be, and any liability (including penalties,
additions to tax interest and expenses) arising therefrom or with respect
thereto. Amounts payable by the Issuer under the indemnity set forth in this
paragraph shall be paid within 30 days from the date on which the applicable
Short Term Trade Series Holder, New Notes

                                      B-17

<PAGE>

Administrative Agent, Paying Agent or Argentine Paying Agent, as the case may
be, makes written demand therefor.

                  Within 30 days after the date of any payment of Taxes under
this Section 2.7, the Issuer will notify the Administrative Agent of such
payment and, at the request of the Administrative Agent, furnish to the
Administrative Agent at its address referred to in Section 9.2 of the
Supplemental Indenture, the original or a certified copy of a receipt evidencing
payment thereof. Upon request, the Issuer shall provide the Administrative Agent
with documentation reasonably satisfactory to the Administrative Agent
evidencing the payment of any Additional Amounts. Copies of such documentation
shall be made available by the Administrative Agent to the Short Term Trade
Series Holders upon request.

                  2.8      ILLEGALITY

                  Notwithstanding any other provision of this Short Term Trade
Series Supplemental Indenture, if any Short Term Trade Series Holder shall
notify the Short Term Trade Series Administrative Agent that the introduction of
or any change in or in the interpretation of an law or regulation makes it
unlawful, or any central bank or other Governmental Authority asserts that it is
unlawful, for such Short Term Trade Series Holder or its Holding Office to
purchase, own, hold or maintain its Short Term Trade Series Note (after such
Short Term Trade Series Holder used such reasonable efforts to transfer its
Short Term Trade Series Notes if such transfer will avoid illegality and shall
not, in the sole judgment of such Short Term Trade Series Holder, be
disadvantageous (economically or otherwise) to such Short Term Trade Series
Holder) the Issuer shall promptly redeem the Short Term Trade Series Note(s)
held by such Short Term Trade Series Holder by paying the principal amount to be
redeemed, together with accrued interest thereon to the date of redemption,
together with any amounts payable pursuant to Section 2.9 in respect of such
redemption.

                  2.9      YIELD PROTECTION

                  If, for any reason, the Issuer makes any payment of principal
with respect to any Short Term Trade Series Note on any day other than the last
day of the Interest Period then applicable thereto, the Issuer shall, promptly
upon demand, reimburse each Short Term Trade Series Holder for any LIBOR Funding
Costs incurred by such Short Term Trade Series Holder of such amount prepaid,
provided that such Short Term Trade Series Holder shall have delivered to the
Issuer a certificate as to the amount of such loss or expense, which certificate
shall be conclusive and binding for all purposes, absent manifest error.

                  2.10     INCREASED COSTS AND REDUCED RETURN

                  2.10.1   If, on or after the date hereof, the adoption of any
applicable law, rule or regulation, or any change in any applicable law, rule or
regulation, or any change in the interpretation or administration thereof by any
Governmental Authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by any Short Term Trade
Series Holder (or its Holding Office) with any request or directive (whether or
not having the force of law) of any such authority, central bank or comparable
agency, (i) shall subject any Short Term Trade Series Holder (or its Holding
Office) to any tax,

                                      B-18

<PAGE>

duty or other charge with respect to one or more of its Short Term Trade Series
Notes, or shall change the basis of taxation of payments to any Short Term Trade
Series Holder (or its Holding Office) of the principal of or interest on its
Short Term Trade Series Notes or any other amounts due under this Indenture or
any Short Term Trade Series Notes, except for the introduction of, or changes in
the rate of, tax on the overall net income of such Short Term Trade Series
Holder (or its Holding Office), or franchise taxes, imposed by the jurisdiction
(or any political subdivision or taxing authority thereof) under the laws of
which such Short Term Trade Series Holder is organized (or in which such Short
Term Trade Series Holder's Holding Office is located); or (ii) shall impose,
modify or deem applicable any reserve (including, without limitation, any such
requirement imposed by the Board of Governors of the Federal Reserve System and
minimum reserve requirements of the European Central Bank but excluding any such
requirement included in an applicable Eurodollar Reserve Percentage), special
deposit, insurance assessment or similar requirement against assets of, deposits
with or for the account of, or credit extended by, any Short Term Trade Series
Holder (or its Holding Office) or shall impose on any Short Term Trade Series
Holder (or its Holding Office) or the London interbank market any other
condition affecting the purchasing, owning, holding or maintaining of any one or
more Short Term Trade Series Notes by such Short Term Trade Series Holder (or
its Holding Office) and the result of any of the foregoing is to increase the
cost to such Short Term Trade Series Holder (or its Holding Office or any
holding company of which such Short Term Trade Series Holder is a subsidiary) of
purchasing, owning, holding or maintaining any one or more of its Short Term
Trade Series Notes, or to reduce the amount of any sum received or receivable by
such Short Term Trade Series Holder (or its Holding Office) under the Indenture
and any one or more of its Short Term Trade Series Notes, by an amount deemed by
such Short Term Trade Series Holder to be material (excluding, for purposes of
this Section 2.10.1 any increased costs or any reductions resulting from any
Indemnifiable Taxes or Other Taxes payable by the Issuer pursuant to Section
2.7), then, promptly upon demand by such Short Term Trade Series Holder (with a
copy to the New Notes Administrative Agent and the Calculation Agent), which
demand shall be accompanied by a certificate of such Short Term Trade Series
Holder setting forth in reasonable detail the circumstances which give rise to
such increase or reduction, the amount of the claim and the calculation thereof
(and which certificate shall be conclusive and binding for all purposes, absent
manifest error), the Issuer shall, to the extent that it shall not have done so
under any other provision of the Indenture, pay to such Short Term Trade Series
Holder such additional amount or amounts as will, without duplication,
compensate such Short Term Trade Series Holder (or any holding company of which
such Short Term Trade Series Holder is a subsidiary) for such increased cost or
reduction.

                  2.10.2   If, on or after the date hereof, any Short Term Trade
Series Holder shall determine that the adoption of any applicable law, rule or
regulation regarding capital adequacy, or any change in any such law, rule or
regulation, or any change in the interpretation or administration thereof by any
Governmental Authority, central bank or comparable agency charged with the
interpretation or administration thereof, or any request or directive regarding
capital adequacy (whether or not having the force of law) of any such authority,
central bank or comparable agency, has the effect of reducing the rate of return
on capital of any Short Term Trade Series Holder (or any holding company of
which such

                                      B-19

<PAGE>

Short Term Trade Series Holder is a subsidiary) as a consequence of such Short
Term Trade Series Holder's purchasing, owning, maintaining or holding any Short
Term Trade Series Notes to a level below that which such Short Term Trade Series
Holder (or its Holding Office or any holding company of which such Short Term
Trade Series Holder is a subsidiary) could have achieved but for such adoption,
change, request or directive (taking into consideration its policies with
respect to capital adequacy) by an amount deemed by such Short Term Trade Series
Holder to be material, then from time to time, promptly upon demand by such
Short Term Trade Series Holder (with a copy to the New Notes Administrative
Agent), which demand shall be accompanied by a certificate of such Short Term
Trade Series Holder setting forth in reasonable detail the circumstances which
give rise to such reduction, the amount of the claim and the calculation thereof
(and which certificate shall be conclusive and binding for all purposes, absent
manifest error), the Issuer shall, to the extent that it shall not have already
done so under any other provision of the Indenture, pay to such Short Term Trade
Series Holder such additional amount or amounts as will, without duplication,
compensate such Short Term Trade Series Holder or its Holding Office (or any
holding company of which such Short Term Trade Series Holder is a subsidiary)
for such reduction.

                  Each Short Term Trade Series Holder will promptly notify the
Issuer, the New Notes Administrative Agent and the Calculation Agent of any
event of which it has knowledge, occurring after the date hereof, which will
entitle such Short Term Trade Series Holder to compensation pursuant to this
Section 2.10. Each Short Term Trade Series Holder will, before requesting
compensation for additional amounts pursuant to this Section 2.10, use
reasonable efforts (consistent with its internal policy and legal and regulatory
restrictions) to minimize or eliminate the requirement of such compensation by
transferring its Short Term Trade Series Notes to a different Holding Office or
otherwise if such transfer or other action will avoid or reduce the need for
compensation for such additional amounts and will not, in the sole judgment of
such Short Term Trade Series Holder, be otherwise disadvantageous (economically
or otherwise) to such Short Term Trade Series Holder; provided that no Short
Term Trade Series Holder shall have any obligation to provide any information as
to any possible actions or designations considered and taken or rejected by such
Short Term Trade Series Holder or the reasons therefore. A certificate of any
Short Term Trade Series Holder claiming compensation under this Section 2.10 and
setting forth the additional amount or amounts to be paid to it hereunder shall
be conclusive and binding for all purposes, absent manifest error.

                  SECTION 3.        COVENANTS

                  In addition to the covenants contained in Articles Eight and
Ten of the Base Indenture, the Issuer agrees that, so long as any amount payable
under any Short Term Trade Series Note remains unpaid, it will comply with the
covenants set forth in Sections 3.1 through 3.5 of the Short Term Trade Series
Supplemental Indenture and the terms and covenants set forth in Annex C to the
Short Term Trade Series Supplemental Indenture under the terms and conditions
set forth therein.

                  SECTION 4.        REPRESENTATIONS AND WARRANTIES

                  The representations and warranties set forth in Annex B to the
Short Term Trade Series Supplemental Indenture under the terms and conditions
set forth therein are incorporated herein by reference.

                                      B-20

<PAGE>

                  SECTION 5.        GOVERNING LAW

                  This Short Term Trade Series Note shall be governed by and
construed and interpreted in accordance with the law of the State of New York;
provided that all matters relating to the due authorization, execution, issuance
and delivery of the Short Term Trade Series Notes by the Issuer, the approval
thereof by the CNV for the offering of the Short Term Trade Series Notes to the
public in Argentina and matters relating to the legal requirements necessary for
the Short Term Trade Series Notes to qualify as obligaciones negociables under
Argentine law shall be governed by the Negotiable Obligations Law and other
applicable Argentine laws and regulations.

                                      B-21

<PAGE>

                     [THE FOLLOWING PROVISION TO BE INCLUDED
                       ON ALL RESTRICTED DEFINITIVE NOTES]

                  In connection with any transfer of this Security occurring
prior to the date which is the earlier of (i) the date of an effective
Registration or (ii) two years after the later of the original issuance of this
Security or the last date on which this Security was held by the Issuer, or an
Affiliate of the Issuer, the undersigned confirms that without utilizing any
general solicitation or general advertising that:

                                            [Check One]

         [  ](a)                            this Security is being transferred
                                            in compliance with the exemption
                                            from registration under the
                                            Securities Act of 1933, as amended,
                                            provided by Rule 144A thereunder.

                                            Or

         [ ](b)                             this Security is being transferred
                                            other than in accordance with (a)
                                            above and documents are being
                                            furnished that comply with the
                                            conditions of transfer set forth in
                                            this Security and the Indenture.

If neither of the foregoing boxes is checked, the Trustee or other Registrar
shall not be obligated to register this Security in the name of any Person other
than the holder hereof unless and until the conditions to any such transfer set
forth herein and in Section 3.06 of the Indenture shall have been satisfied.

Date: ________________________              ____________________________________
                                            NOTICE: The signature to this
                                            assignment must correspond with the
                                            name as written upon the face of the
                                            within-mentioned instrument in every
                                            particular, without alteration or
                                            any change whatsoever.

TO BE COMPLETED BY PURCHASER IF (a) ABOVE IS CHECKED.

         The undersigned represents and warrants that it is purchasing this
Security for its own account or an account with respect to which it exercises
sole investment discretion and that it and any such account is a "qualified
institutional buyer" within the meaning of Rule 144A under the Securities Act of
1933, as amended, and is aware that the sale to it is being made in reliance on
Rule 144A and acknowledges that it has received such information regarding the
Issuer as the undersigned has requested pursuant to Rule 144A or has determined
not to request such

<PAGE>

information and that it is aware that the transferor is relying upon the
undersigned's foregoing representations in order to claim the exemption from
registration provided by Rule 144A.

Date: ________________________        __________________________________________
                                      NOTICE: To be executed by an executive
                                      officer

<PAGE>

                                                                       EXHIBIT C
                               TO SHORT TERM TRADE SERIES SUPPLEMENTAL INDENTURE

Form of Certificate to Be Delivered
in Connection with Transfers
Pursuant to Regulation S

[Trustee]
Attention:

Re: Pecom Energia, S.A. (the "Issuer")
       %           Notes due   (the "Securities")

Dear Sirs:

                  In connection with our proposed transfer of $_______ aggregate
principal amount of the Securities, we confirm that the sale to [specify
transferee] has been effected pursuant to and in accordance with Regulation S
under the Securities Act of 1933, as amended, and, accordingly, we represent
that:

                  1.       the offer of the Securities was not made to a person
in the United States;

                  2.       at the time the buy order was originated, the
transferee was outside the United States or we and any person acting on our
behalf reasonably believed that the transferee was outside the United States;

                  3.       no directed selling efforts have been made by us in
the United States, as applicable; and

                  4.       the transaction is not part of a plan or scheme to
evade the registration requirements of the U.S. Securities Act of 1933.

                  You and the Issuer are entitled to rely upon this letter and
are irrevocably authorized to produce this letter or a copy hereof to any
interested party in any administrative or legal proceedings or official inquiry
with respect to the matters covered hereby. Terms used in this certificate have
the meanings set forth in Regulation S.

                                            Very truly yours,

                                            [Name of Transferor]

                                            By:
                                                  Authorized Signature

                                      C-1