Ratios of the XSL spectra to our MUSE spectra (blue; covers only the MUSE wavelength range), normalized to unity and median smoothed for display purposes with a five-element wide median filter. Two ratios are shown for HD 101712 – for the two XSL spectra of this star. A second-order polynomial fit spanning the wavelength of XSL is also shown in blue. The labels on the top of each panel contain the name of the object, the normalization factor that indicates the flux ratio of the independently flux-calibrated MUSE and XSL spectra, and a standard deviation of the residuals of the fit. The coefficients of polynomial fits are listed in Table B.1.