1 EXHIBIT 10.13 [CONTINENTAL NATURAL GAS, INC. LETTERHEAD] January 1, 1997 Mr. Ric Hedges CONTINENTAL NATURAL GAS MARKETING, LLC 1412 S. Boston, Suite 500 Tulsa, OK 74119 Contract No.: CNG-1149L(S) Dear Mr. Hedges: CONTINENTAL NATURAL GAS, INC. (CNG)...