[daip] Channel 0's

[Lynn D. Matthews]

I was wondering how the new FILLM selects the channels it uses for the
computation of the new Channel 0. If the answer is "inner 75%", then my
second question is how this differs from the default "inner 75%" used by
AVPSC. I was curious, since this latter program (used in default mode) has
the property of reassigning the reference pixel to a non-integer value,
whereas FILLM does not, and a comparison I've done between the two
resulting CH 0's shows they are not identical.

Lynn