H_E brightness versus compactness estimated from a flux ratio in 2″.0 to 1″.5 apertures. Selected sources are required to be relatively compact with an aperture ratio below 1.2. The H_E compactness of genuine point sources identified in I_E from the parent catalogue is shown by the grey 2D histogram. Sources below a ratio of 1.0 are visually confirmed to have significantly negative pixels nearby.