gas swap price

Charlie & Steve,

I work in the power structuring group and need your assistance in pricing a gas swap. The details are as follows:
Jan 1, 2002 - Dec 31, 2012
transco z6
priced at mid

I'm sure I am missing some inputs since I am new to this. Please tell me what else I need to provide you. Could you please give me one price with basis included and one without basis.

Thanks,

Steve
x3-7214