| 1 | bright source in the field (4U, Vela SNR, Cygnus loop) |
| 2 | J and/or 2-6keV band data show evidence for the presence of a source in the field of view. |
| 4 | M and/or I-band data show evidence for the presence of a source in the field of view. |
| 8 | B and/or C-band source was in the field of view (HZ43, AM Her, Cygnus Loop, Vela SNR, Sco X-1, U Gem) |
| 16 | payload was pointed at the Earth |
| 32 | not used |
| 64 | not used |
| 128 | not used |
| 256 | B and/or C-band data are possibly contaminated. |
| 512 | B and/or C-band data are definitely contaminated. |
| 1024 | not used |
| 2048 | livetime correction is uncertain. |
| 4096 | fewer than 50 useful telemetry subframes in the observation |
| 8192 | observation contains bad telemetry. |