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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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