iraf.net

NUMBER:	213
MODULE:	images.imcombine ccdred.combine
SYSTEM:	V2.9-V2.10.2
DATE:	Mon May 10 14:57:05 MST 1993
FROM:	valdes

BUG:	When using a median combining operation, no rejection or with
	mclip=no, and outputing a sigma image, the sigma image is incorrect.
	This is due to the median computation destroying some of the
	input data values before the sigma is computed.  The workaround
	when both output median and sigma images are desired is to used
	one the rejection options with mclip=yes.  By choosing the
	rejection option sigclip with low and high sigma thresholds
	of 1000 no pixels will be rejected and the results are the
	same as not specifying a rejection algorithm.

STATUS:	Fixed in V2.10.3.