Illustration of example SExtractor detections. In each case the yellow circle has a diameter of 20 arcsec and is centered on the object in question. Numbers in the upper right corner denote absolute R-band magnitudes. Upper panel: simulated galaxies placed into deep science images. Middle panel: objects accepted as possible members after visual inspection. Lower panel: rejected objects because of compact appearance or visible structure typical of background grand-designed spirals or mergers.