file1.fits
and (if specified) file2.fits.
Optional constant in the denominator can be specified using
the const= option.
Optional constant in the numinator can be specified using
the mul= option.
The full evaluation is
output = (mul*file1/(const*file2))The data are written into
file1.fits unless
overridden by the outfile option.
The arithmetic is done in a floating point buffer, but may be
clipped when writing to 16 bit output file.
Values are optionally clipped to the range specified by the
min= and max= options.
When clipping occurs the number of pixels are printed to stdout
as nclip=.
div alphalyr flat mul=10000 alphalyr.fits by the file
dark.fits and multiplies the result by 10,000.
The result overwrites alphalyr.fits