Example of a telluric correction spectrum computation for a typical night. Top panel: all the reference normalized standard star spectra of the night and their continua C (dashed lines). Middle panel: adjusted telluric template intensities as function of their saturation. Bottom panels: dependence with respect to airmass of integrated over each group of lines (shaded areas in middle panel). The dashed lines represent the airmass dependence with a fixed saturation exponent.