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Table 1
Skycorr default parameter set-up.
| Parametera | Value | Short description |
|
|
||
| vac_air | vac | wavelengths in vacuum or air |
| fwhm | 5.0 | initial estimate of line FWHM (in pixels) |
| varfwhm | 0 | linear increase of line width with |
| wavelength? (1 = yes, 0 = no) | ||
| ltol | 1e-2 | relative FWHM convergence criterion |
| min_line_dist | 2.5 | minimum distance to neighbouring lines |
| for isolated lines (in FWHM) | ||
| fluxlim | –1 | minimum line peak flux (in median flux |
| of identified lines) | ||
| ftol | 1e-3 | relative χ2 convergence criterion |
| xtol | 1e-3 | relative parameter convergence criterion |
| wtol | 1e-3 | convergence criterion for iterative |
| improvement of wavelength grid | ||
| cheby_max | 7 | maximum degree of polynomial for |
| wavelength grid correction | ||
| cheby_min | 3 | minimum degree of polynomial for |
| wavelength grid correction | ||
| cheby_const | 0. | initial constant term for wavelength grid |
| correction | ||
| rebintype | 1 | type of rebinning (0 = simple, |
| 1 = asymmetric, damped sinc kernel) | ||
| weightlim | 0.67 | minimum relative weight of the strongest |
| line group of a pixel | ||
| siglim | 15. | σ limit for excluding outliers |
| fitlim | 0. | lower relative uncertainty limit for fitting |
| a line group | ||
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