| 1 | source on a bad pixel |
| 2 | source on a readout streak |
| 4 | source on a smoke-ring |
| 8 | source on a diffraction spike |
| 16 | source affected by Mod-8 pattern |
| 32 | source within the central enhancement |
| 64 | source near a bright source |
| 128 | source near the edge |
| 256 | point source within an extended source |
| 512 | weird source (bright pixel) |
| 1024 | multiple exposure values within photometry aperture |
| 2048 | the source is too bright (rate>0.97ct/frame) |