iraf.net

NUMBER:	273
MODULE:	dopcor
SYSTEM:	V2.10.3BETA
DATE:	Wed Jan 18 17:22:38 MST 1995
FROM:	valdes

BUG:	For multispec spectra which have independent wavelengths for each
	spectrum (identified by system=multispec in the header) there
	is a bug such that if there are more than 8 spectra the message:

	Warning: MWCS: too many coordinate transformation (ctran) descriptors
	ERROR: segmentation violation

	appears.  Most commonly this will affect echelle data.  The
	workaround is to apply DOPCOR with the aperture parameter
	in groups of 8 or less spectra.  For example:

	    cl> dopcor obj.ec obj1.ec -120 isvel+ add- ap=1-8
	    cl> dopcor obj1.ec obj1.ec -120 isvel+ add- ap=9-16
	    ...

	Note the second and subsequent steps work in place.

STATUS:	This bug, which is a typo in the code, is fixed for a release after
	V2.10.3BETA (possibly the Solaris patch) and V2.11.