Free Access

Table 3

Molecfit parameter set-up for the telluric absorption correction evaluation of NIR-arm X-Shooter TSS spectra.

Parametera Value Short description

wlgtomicron 10-3 factor to convert the input wavelength units into μm
vac_air air wavelengths in vacuum or air
ftol 10-2 relative χ2 convergence criterion
xtol 10-2 relative parameter convergence criterion
list_molec O2 CO2 H2O CH4 CO list of molecules to be included in the model
fit_molec 0 0 1 0 0 flags for if each molecule is to be fit (1 = yes, 0 = no)
relcol 1. 1.05 1. 1. 1. relative molecular column densities (1  =  input profile)
fit_cont 1 flag for polynomial fit of the continuum (1 = yes, 0 = no)
cont_n 1 degree of polynomial for the continuum fit
cont_const 104 initial constant term for the continuum fit
fit_wlc 1 flag for refinement of wavelength solution (1 = yes, 0 = no)
wlc_n 0 degree of Chebyshev polynomial for refined wavelength
wlc_const 0. initial constant term of the Chebyshev polynomial
fit_res_box 1 flag for resolution fit using a boxcar filter (1 = yes, 0 = no)
relres_box 0.75 initial value for FWHM of boxcar relative to slit width
(0 and 2)
kernmode 0 kernel mode (0 = independent Gaussian and Lorentzian,
1 = Voigt profile)
fit_res_gauss 1 flag for resolution fit using a Gaussian filter (1 = yes, 0 = no)
res_gauss 1. initial value for FWHM of Gaussian (in pixels)
fit_res_lorentz 0 flag for resolution fit using a Lorentzian filter (1 = yes, 0 = no)
res_lorentz 0. initial value for FWHM of Lorentzian (in pixels)
kernfac 3. kernel size in units of FWHM
varkern 1 flag for selecting a constant (=0) or a variable kernel ( = 1)
pixsc 0.20 pixel scale in arcsec

Notes. (see the molecfit User Manual for more details).


Only parameters required for the fitting procedure and specific to the X-Shooter data are 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.