Visualize the summary images from a run of imgcat0. The image names can be read from a local file named Active.Images. If this file does not exist at runtime, then one is created using the routine active_imgcat0 (you can read about the contents of Active.Images in this link). This latter routine will assume you are in the working directory where the imgcat0 run was executed.

  
% ds9_imgcat0 --help 
% ds9_imgcat0 /home/sco/AUTO_match_for_wcs/S/20191018T024545.3_acm_sci.fits N 

The results of a ds9_imgcat0 run for an imgcat0 run on a PFC image or the NGC3379 field. % ds9_imgcat0 Rsco2039.fits N The contents of the frames are: frame 1 = The original image with the background boxes overplotted. frame 2 = The background map derived from a 2-D polynomial mapping. frame 3 = The (sigma) detection map (i.e. stan.dev units above background) frame 4 = The label0 map. You can use a local file named "ds9_open.Size" to customize the size of the ds9 window. The display of the lower-right image, the "lablel0" image, is not extremely useful here. The connected pixels of each detected object are assigned a value corresponding to the object ID number. The largest obsject, in this case NGC3379 is assigned ID=1, the second largest is assigned ID=2, etc... To display all of the detected atrgets with unique colors is difficult (there are 936 sources in this single image!). The most useful way to use the label0 image is to view it interactively with ds9 (via ds9_imgcat0) and then tailor the color scale to the region of the image you are interested in.