> You could use CCDPACK:MAKECAL with text file of NDF names, a method of
> mean, minpix=number of input NDFs, expose=1 and then multiply the output
> NDF by the number of input NDFs. The downside is that the result would be
> padded to encompass all the input data.
Yes I looked at MAKECAL first, but it has the same problem with bad
pixels. You either create more bad pixels if any position has a bad
pixel (as in the above), or overestimate the sum.
Malcolm
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