SYSTEM: V2.9
NUMBER: 129
MODULE: onedspec.splot, onedspec.calibrate
SYSTEM: V2.9
DATE: Tue Jul 10 17:07:46 MST 1990
FROM: valdes
BUG: In SPLOT the first pixel is ignored. In CALIBRATE the wavelength
scale for extinction correction will be in error by one pixels.
STATUS: These two bugs are related because the header parameter NP1,
which is the offset to the first valid pixel, should be zero in
most cases but a bug fix in Nov. 1989 put in a minimum value of 1.
The symptom in SPLOT is to lose the first pixel but the
wavelength scale is correctly compensated. In CALIBRATE the
wavelength scale is not compensated though the error should be
extremely small since the calibrations are interpolations from
a smooth curve. There is no easy work around for SPLOT. If
the one pixel wavelength error in CALIBRATE is a concern one
could reset the wavelength zero point parameter W0 or CRVAL1 to
be greater by WPC or CDELT1; i.e. make the starting wavelength
parameter refer to pixel 2. Note that this will make the
wavelengths wrong for SPLOT and other ONEDSPEC tasks. This bug
is corrected in V2.10.
NUMBER: 198
MODULE: images.imcombine
SYSTEM: V2.10.2
DATE: Wed Jan 20 16:30:10 MST 1993
FROM: valdes
BUG: The CCDCLIP and CRREJECT algorithms quietly fail to reject any pixels.
The basic source code is actually correct but due to a dependency
condition based on file dates the wrong derived code wes used
resulting in a mismatched argument list. This mismatch generally
results in the rejection algorithm seeing that there are zero
images to process and so no rejection is done. The workarounds
are to use a different rejection option or the CCDRED.COMBINE
version which is the same except for the ccdtype, keyword
mapping, and filter subset features.
STATUS: Fixed in V2.10.3.
NUMBER: 408
MODULE: ccdred.ccdmask
SYSTEM: V2.10-V2.11.1
DATE: Fri Aug 14 10:11:44 MST 1998
FROM: valdes
BUG: Single bad pixels are not found. There is no workaround. The code
fix is simple. In file noao$imred/ccdred/src/t_ccdmask.x change
line 198
from: if (data[i,j] < low && data[i,j] > high) {
to: if (data[i,j] < low || data[i,j] > high) {
Contact iraf@noao.edu for instructions on how to update an
IRAF package, in this case CCDRED.
STATUS: Fixed for next release.