iraf.net

NUMBER:	255
MODULE:	apall, apsum
SYSTEM:	V2.10-V2.10.2
DATE:	Tue Aug  9 10:47:21 MST 1994
FROM:	valdes

BUG:	When extracting spectra with dispaxis=1 (spectra horizontal) using
	variance weighting and/or cleaning with a gain other than 1 then
	occasionally a 'floating operand error' or some arithmetic
	exception can occur.  This is caused by reference to unitialized
	memory during application of the gain.  The uninitialized memory
	does not affect the results but if an invalid arithmetic value
	is encountered it will cause the extraction to abort.  The
	workarounds in this case are to use a gain of 1 if it is
	reasonable otherwise to transpose the image and reset the
	wcs (with wcsrest  wcs=physical) and the dispaxis
	value.

STATUS:	Fixed after V2.10.2.