STScI Logo


.help qplot Sep95 rvsao
qplot -- Use EMSAO to plot emission and absorption lines already found
in a spectrum file or list of spectra
qplot spectra

.ls spectra = ""
List of file names of spectra to analyze. @filename indicates list should
come from file filename. As of version 1.3, apertures of multispec
spectrum files can be entered as numbers, lists, or ranges enclosed in
brackets after each file name in the list or file.  This parameter is
directly passed to the task chosen below.
.ls qtask = "xcsao"
Task to run (xcsao or emsao)"}
QPLOT runs either XCSAO without correlating or EMSAO with finding new
lines, then displays the spectrum with lines labelled and
previously-obtained results.  These results should have been written
to the image headers using save_vel=yes when XCSAO and EMSAO were run.
The cursor mode is turned on, so that initial conditions can be changed
(such as a new redshift guess or deleted cosmic ray) and the program
(XCSAO or EMSAO) can be rerun.  The main reason for using QPLOT is to
set a quality flag in the spectrum image header.  If the task is not
rerun, only the summary information is rewritten.  If the spectrum is
recorrelated or refit, the new results are only written to the spectrum
header if a quality flag (y=OK, n=bad, j=questionable) is set.

To check the redshift of a single galaxy

        cl> qplot galaxy

To check redshifts for a whole night's worth of galaxy spectra:

        cl> qplot


Source Code · Search Form · STSDAS