for the selected configuration,
,
and
(S/N), compute:
S = expected signal due to the Zodiacal light.
K = 
for a point source, or 1
for an extended source. This factor takes into account the size of
the PSF. It assumes that the point source flux is spread uniformly
over 
pixels.
s = 
expected signal due to the source.
= function of S and 
(see section
).
= function of S and (see section
).
.
= 
.
Then solve for :
