Samples of the real–bogus system identified bogus sources, but without “bad flags.” They can be classified as (1) cosmic rays (blue), (2) non-detections (deep green), (3) bright star spikes (yellow), (4) optical effect (orange), (5) over-exposure bright sources (red), (6) interpretation pixels (purple), (7) faint blurry sources (light green) and extended sources in crowded fields (brown). (Color online)