v1_1_4 (July 10, 2003)
- At least some longslit data now is successfully reduced by the
pipeline. No guarantees on reduction quality. Things are probably
good enough for standard stars, at least.
- New superdarks have been added for 2003 (FCS intensity has been
greatly decreased). We do not have any new ones for 900-line data -
that is needed. Update your CALIB_DATA files.
- After we implemented the slit-end corrections for v1_1, we figured
that it'd be OK to exclude only the outermost 4 pixels on each slit,
rather than the outermost 5. However, the skylines are actually a
bit sharper on that 5th pixel than along the rest of the slit; this
caused the b-spline sky spectrum to be too sharp, especially on
short slits, and accordingly the sky subtraction to yield
'hollowed-out', 'donut' residuals (negative in the center of the
line, positive on the outside). Rerunning v1_1 reductions is
- Shifts between science data and flats are now determined robustly
when the shifts are >~1.5 pix (via a cross-correlation to get an
initial guess, followed by the existing centroid method); that was
not true before. Wavelength solutions in cases with large shifts
could definitely be problematic, though..
- In cases where the arc-fitting yields poor results or few lines, we
now fall back to the optical model + cross-correlation for
wavelength solution and tilts.
- 'optimal' extractions in EXTRACT1D now uses FWHM=10 pixels if FWHM=0
is passed to it. This was a problem in a number of non-DEEP
reductions, yielding optimal spectra that were 0 everywhere (boxcar
was still OK).
- wavelength scales on the Allslit files are now correct (was a