Free Access

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

Notes.

(a)

Input/output parameters are not listed.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.