... Reads source extraction tables, FITS images from input lists and if absolute refinement is desired, a list of absolute point source positions; . ... When absolute astrometric references are available, the ``fiducial'' reference image (mosaic) frame is treated like a single input image, which contains the absolute point source positions. ... Input image overlap coverage was . ... The SSC point source extractor was then used to extract point sources from each input image (with pointing error). ...