APEDIT

Frank Valdes wrote on Feb 23, 1998

Q:  An IRAF question, concerning APEDIT. The task often chooses a
cosmic-ray hit (or some other artifact) as aperture #1. By using
keystroke "n", one can then choose the intended aperture, now named #2,
which contains the stellar spectrum. Is there any easy way to relabel
the latter aperture as #1, while simultaneously removing all reference
to the original aperture #1 ? Or, to permit, originally, a manual
choice of the stellar spectrum as aperture #1 ?


A:  The easiest thing in the situation you describe of manually fixing
a single aperture is to type 'd' to delete the bad aperture and then
type 'n' to mark the new aperture.  Note that you can indeed renumber
an aperture with 'i'.  Another hint to pass along is that if you
have lots of problems with cosmic rays you can use a negative value
for "nsum" where the absolute value specifies the number of lines
and the negative means use a median instead of an average.

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Last post on Feb 23, 1998