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Table 1
Optimal extraction algorithms.
| Reference | Cross-section model | Comment |
|
|
||
| Hewett et al. (1985) | average along dispersion | assumes no order tilt |
| Horne (1986), Robertson (1986) | polynomials along dispersion | assumes small order tilt |
| Urry & Reichert (1988) | Gaussian function | |
| Marsh (1989) | coupled polynomials along dispersion | employs spatial subpixel grid |
| Piskunov & Valenti (2002) | penalised functions in spatial direction | employs spatial subpixel grid |
| This work | (master flat) | requires stabilised spectrograph |
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