Omgsource is an interactive SAS task which enables the user to reprocess an OSW rotated grism-image produced by the SAS task omgchain. A couple of examples where the user will find omgsource useful are:
The task allows the user to interactively select spectra from the input image: the width and height of the central spectrum extraction region, the widths and offsets (from the central extraction region) of the two background regions (one either side of the central region) can be varied. The selected spectra are processed using the SAS task omgrism. A new source-list and spectrum-list fits file are produced, together with a spectrum-plot postcript file. These output files have the same format as those produced by the SAS task omgchain. The spectrum plot file is produced using the SAS task omgrismplot.