iraf.net

NUMBER:	181
MODULE:	ccdred.ccdproc
SYSTEM:	V2.9(?) V2.10.1
DATE:	Tue Sep 22 08:40:14 MST 1992
FROM:	valdes

BUG:	When using STF images with a flat field that has been processed but
	has lost the CCDMEAN keyword CCDPROC will produce an error of the
	form:

	    ERROR: OPEN: File does not exist (tmp4294ha.hhd)

	A flat field in this state would most likely be produced by
	FLATCOMBINE with preprocessing before combining selected.  The
	combined flat field will lack the CCDMEAN keyword.

	The workarounds are to either use OIF images or add the CCDMEAN
	keyword manually.  This would be done by using IMSTAT to compute
	the mean and adding the CCDMEAN keyword with that value using
	HEDIT.

STATUS:	The error is ignored by CCDPROC in V2.10.2.  The reason for the
	error when calling imunmap with an image which has been created
	but for which no pixel data has been written is under investigation.

NUMBER:	294
MODULE:	photcal.mkapfile,photcal.apfile
SYSTEM:	V2.10
DATE:	Tue Jun 13 17:25:01 MST 1995
FROM:	davis

BUG:	Mkapfile/apfile may terminate prematurely or hang with a floating
	overflow exception if the input data  is such that it is difficult
	to determine a good value for the Moffat function radius parameter
	RO. In this case RO can be driven towards and beyond 0 which produces
	the overflow. 

STATUS:	A check was added to the code to trap this condition and report a
	fitting error. Possible work arounds including upping the default
	number of parameters to be fit from 3 to 4 and/or deleting the
	suspect data from the input file.