EXHIBIT 4.1 SOUTHERN NATURAL GAS COMPANY, as Company and THE BANK OF NEW YORK, as Trustee INDENTURE Dated as of March 5, 2003 Series A and Series B 8 7/8% Notes due 2010 TABLE OF CONTENTS ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCEIndenture • March 5th, 2003 • Southern Natural Gas Co • Natural gas transmission • New York
dated as of March 5, 2003 amongRegistration Rights Agreement • March 5th, 2003 • Southern Natural Gas Co • Natural gas transmission • New York
EXHIBIT 1.1 $400,000,000 MILLION PRINCIPAL AMOUNT SOUTHERN NATURAL GAS COMPANY 8.875% SENIOR NOTES DUE 2010 PURCHASE AGREEMENTSouthern Natural Gas Co • March 5th, 2003 • Natural gas transmission • New York
