iraf.net

NUMBER:	361
MODULE:	scombine
SYSTEM:	V2.10.3-V2.10.4p2
DATE:	Wed Feb 19 11:19:14 MST 1997
FROM:	valdes

BUG:	If several multispec images with the 'equispec' coordinate system
	(headers 'WAT0_001 = 'system=equispec'' and with APNUM keyword)
	are being combined by aperture where the set of apertures in each
	image are not the same and if the first image in the input list
	does not contain all the apertures then an error about a missing
	aperture will occur.  For example:

	    ERROR: Image header parameter not found (APNUM79)

	More precisely, the problem occurs if the output image will
	have more apertures than in the first input image.

	The workarounds are to either put an image which has all the
	apertures first in the input list or use the 'aperture' parameter
	to select fewer or an equal number of apertures to the first
	image.  For example:

	    cl> scombine a,b,c,d out1 apertures=1-50
	    cl> scombine a,b,c,d out2 apertures=51-100
	    cl> scopy out1,out2 out

	where the input images contain apertures 1 to 60 but there with
	missing apertures in each image.  Image a has 50 apertures.
	Note that it is alright to specify apertures that do not exist
	as long as the number of existing apertures does not exceed
	the number in the first input image.

STATUS:	Fixed for the next release.