iraf.net

NUMBER:	364
MODULE:	onedspec
SYSTEM:	V2.10-V2.10.4p2
DATE:	Tue Mar  4 11:55:48 MST 1997
FROM:	valdes

BUG:	The coordinate function driver, the system software that evaluates
	coordinates, for multispec format spectra incorrectly inverts
	wavelengths to pixels for the case of log sampled coordinates
	with a doppler shift.  This will cause various tasks to misbehave
	such as equivalent width measurements in SPLOT.  The log
	sampling occurs when using DISPCOR with log=yes and the doppler
	shift is added to the coordinate system when DOPCOR is run.
	The workaround is to not run DOPCOR on log sampled multispec
	spectra (such as echelle data) and correct any measurements
	made for doppler shifts after the fact.  To determine if
	you have this type of format you will 'specN=' strings in
	WAT keywords.  In these strings the third number will be 1
	for log sampling and the seventh number will be non-zero
	for the doppler correction.

STATUS:	Fixed in the next release.