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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
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



Input/output parameters are not listed.

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