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include <imhdr.h>
include "../lib/noise.h"
# AP_PADU -- Procedure to set the gain parameter for the noise model
# computation.
procedure ap_padu (im, ap)
pointer im # pointer to IRAF image
pointer ap # pointer to apphot structure
pointer sp, key
real padu
real imgetr(), apstatr()
begin
call smark (sp)
call salloc (key, SZ_FNAME, TY_CHAR)
call apstats (ap, GAIN, Memc[key], SZ_FNAME)
if (Memc[key] == EOS)
padu = apstatr (ap, EPADU)
else {
iferr {
padu = imgetr (im, Memc[key])
} then {
padu = apstatr (ap, EPADU)
call eprintf ("Warning: Image %s Keyword %s not found.\n")
call pargstr (IM_HDRFILE(im))
call pargstr (Memc[key])
}
}
if (IS_INDEFR(padu) || padu <= 0.0)
call apsetr (ap, EPADU, 1.0)
else
call apsetr (ap, EPADU, padu)
call sfree (sp)
end
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