iraf.net

NUMBER:	244
MODULE:	imcombine, combine, scombine
SYSTEM:	V2.10
DATE:	Wed May 25 11:10:50 MST 1994
FROM:	valdes

BUG:	When combine=average, reject=(sigclip, avsigclip, ccdclip, or pclip),
	and mclip=yes (the value of mclip does not matter for pclip) the
	average will be incorrect if the number of low pixels rejected is
	greater than the number of unrejected pixels.  For example if 3 low
	pixels are rejected and only 2 pixels remain then the final average
	will be incorrect for that pixel.  There is no workaround other
	than to avoid this combination of parameters.

STATUS:	Fixed in V2.11.