iraf.net

NUMBER:	193
MODULE:	sensfunc
SYSTEM:	V2.9-2.10.2
DATE:	Mon Dec 21 13:01:36 MST 1992
FROM:	valdes

BUG:	SENSFUNC will not work when the standards file has a starting
	wavelength greater than the ending wavelength.  The workarounds
	are to linearize the spectra with an increasing wavelength,
	flip the spectra in STANDARD (i.e. standard spec[-*]), or
	edit the standards file to reverse the starting and ending
	wavelengths.  In the latter two cases the sensitivity function will
	then have a reversed sense from the data but the calibration will
	still correctly match wavelengths.

STATUS:	It is the intention that no spectral task care which way the
	wavelength runs relative to the pixels.  SENSFUNC has been
	modified to work in either case for the next release.