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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 |
|
|
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| 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 |
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