iraf.net

NUMBER:	394
MODULE:	apall, apsum
SYSTEM:	V2.11 - V2.11.1
DATE:	Thu Feb 19 15:11:13 MST 1998
FROM:	valdes

BUG:	When the output format is 'echelle' and the 'extras' information is
	produced (extras=yes and background subtraction or cleaning or
	variance weighting) then the header information may come out
	for a 2D images instead of a 3D image.  The consequence of this
	is that SPLOT or other ONEDSPEC tasks will not be able to find
	and use the extra data.  This appears to happen with Solaris
	and not with SunOS so there is some system dependence on whether
	this happens or not.  The workaround is to edit the header to
	change WCSDIM to 3 and add the keywords CD3_3 and LTM3_3 with
	value of 1:
	    
	    cl> hedit  wcsdim 3
	    cl> hedit  cd3_3 1.
	    cl> hedit  ltm3_3 1.

	Another workaround is to set the output format to 'multispec'
	instead of 'echelle'.  If nsubaps=1 then there is no difference
	except for the image name extension between the two formats.

STATUS:	Fixed for the next patch or release.