iraf.net

NUMBER:	305
MODULE:	apextract tasks
SYSTEM:	V2.10-V2.10.4
DATE:	Wed Aug  2 13:57:09 MST 1995
FROM:	valdes

BUG:	If the image header has an invalid DISPAXIS value, for example
	a value of -9999, there is no warning and bad things happen.  If
	the value is less than 0 then the editing plot will show a flat
	line with an X range 1-2.  If the value is 0 or greater than 2 then
	the aperture axis will be shown as either 1 (for even values) or 2
	(for odd values)  but tracing will fail and extraction will produce
	a floating operand error.  The workaround is to either delete the
	invalid keyword and use the 'dispaxis' parameter or fix the image
	header value.

STATUS:	In subsequent releases there will be a warning message and the
	invalid value will be ignored.  The 'dispaxis' value will then
	be used.