iraf.net

NUMBER:	316
MODULE:	images.imcombine, ccdred.combine, onedspec.scombine
SYSTEM:	V2.10 - V2.4
DATE:	Thu Oct 19 12:24:43 MST 1995
FROM:	valdes

BUG:	In the PCLIP rejection option, if more than the maximum number
	of pixels that are allowed to be rejected (set by the nkeep
	parameter) are rejected at some point along the output line then
	for all subsequent pixels in that line the rejection threshold will
	be much higher.  Thus there may be pixels that should be rejected
	but will not be.  The workaround is to set nkeep to zero.  Note
	that since the sigma is estimated based on the difference between
	the median and some percentile pixel you are guarenteed never to
	reject all the pixels.


STATUS:	Fixed in later versions.