CRIRES⁺ on UT3 (red) and UVES on UT2 (blue) normalised reduced spectra towards HD 33793, taken simultaneously with 60 s exposure time using a 0.4″ slit. The UVES spectra have been smoothed to match the CRIRES⁺ observations. The orange line shows the UVES spectrum divided by the CRIRES one. The CRIRES data were reduced using calibrations taken eight months after the observations with a 0.2″ slit and are shifted in wavelength to match the UVES observations. The UVES pipeline resamples the reduced spectra.