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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
solution
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).

(a)

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

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