Southern Star Central Gas Pipeline, Inc.

Original Volume No. 1

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Effective Date: 05/01/2003, Docket: RP03-352-000, Status: Effective

Original Sheet No. 502 Original Sheet No. 502 : Effective

FORM OF

ELECTRONIC DATA INTERCHANGE

TRADING PARTNER AGREEMENT

Section 2. Transmission.

2.1 Proper Receipt. "Proper Receipt" means Documents and Transactions are

accessible in proper form to the receiving Party at such Party's Receipt

Computer designated in the Appendix. Proper Receipt of a Document or

Transaction shall not mean such Document or Transaction is valid, or

accepted. No document or Transaction shall give rise to any obligation

under this Agreement unless Properly Received. Where the Parties employ

the services of Providers to transmit and receive Documents, the Receipt

Computer shall be defined in the Appendix as the receiving Party's

electronic mailbox provided by the receiving Party's Provider.

2.2 Verification.

2.2.1. Upon proper receipt of any Document, the receiving party

shall promptly and properly transmit a functional

acknowledgment in return, unless otherwise specified in the

Appendix.

2.2.2. For the purposes of this Agreement, a "functional

acknowledgment" means an ASC X .12 Transaction Set 997,

which confirms a Document (in the format specified by such

acknowledgment) has been received and whether all required

portions of the Document are syntactically correct, but

which does not confirm the substantive content(s) of the

related Document.

2.2.3. By mutual agreement, the parties may designate in the

Appendix a "response document" Transaction Set as a

substitute for or in additional to an ASC X .12 Transaction

Set 997. A "response document" confirms that a Document

(in the format specified by such acknowledgment) has been

received, and whether all required portions of the Document

are syntactically correct, and contains data sent by the

receiving party to the sending party in response to the

substantive content of the related Document. If the

parties designate a response document as a substitute for a

functional acknowledgment, the time requirements in the

Appendix applicable to functional acknowledgments shall

apply to such response documents.