subroutine omsource 1) Read in image 2) If present, read in the old source-list file 3) Display the image 4) Display the main window allowing the user to: a) Select a particular source to either redo the photometry or delete it. b) Select additional sources from the image to add to the source-list. The position, shape, photometric and astrometric properties are calculated for each source in a similar fashion to what the sas tasks omdetect, ommag and omatt do. c) Print the source list. d) Display the main image (using ds9). e) Run omdetect When the user quits the program the new source-list file is constructed from the current stored source-list. This source-list file can then be used as an input source-list file to either omsource or omsrclistcomb. end subroutine omsource