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Table 1.
Bad pixel flags used in the MUSE pipeline.
| Flag value | Bit-shift | Data quality condition |
|---|---|---|
| 0 | 0 | Good pixel – no flaw detected |
| 1 | 1 | Affected by telluric feature (corrected) (a) |
| 2 | 1 ≪ 1 | Affected by telluric feature (uncorrected) (a) |
| 32 | 1 ≪ 5 | Cosmic ray (unremoved) (b) |
| 64 | 1 ≪ 6 | Low QE pixel (< 20% of the average sensitivity; e.g., defective CCD coating, vignetting) |
| 256 | 1 ≪ 8 | Hot pixel (> 5σ median dark) |
| 512 | 1 ≪ 9 | Dark pixel (permanent CCD charge trap) |
| 4096 | 1 ≪ 12 | A/D converter saturation (signal irrecoverable, but known to exceed the A/D full-scale signal) |
| 8192 | 1 ≪ 13 | Permanent camera defect (such as blocked columns, dead pixels) |
| 16384 | 1 ≪ 14 | Bad pixel not fitting into any other category (c) |
| 230 | 1 ≪ 30 | Missing data (pixel was lost) |
| 231 | 1 ≪ 31 | Outside data range (e.g., outside of spectral range, inactive detector area, mosaic gap) |
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