Spectra of the star 48 889 (black) and of the telluric standard star (red) before telluric correction. The abscissa is in cm^-1, red is left. The wavelength calibration is from the CRIRES pipeline, without further adjustment, and shows a shift of about 0.5 cm^-1 towards the red with respect to the nominal wavenumber of the telluric lines. The wavelength calibration and the correction for stellar radial velocity were performed in the last step of the data reduction, after telluric correction.