Best fit to the XSL spectrum of HD 111515 (observation X0901), at R = 3000, using all (but masked) wavelengths. Each XSL-arm is rescaled independently to optimize the global quality of the fit. The model is shown in red. In the top panel, the blue-black-blue color-scheme identifies the three arms of X-shooter spectra, which are then shown separately (in black) in the three lower panels. Masked wavelength regions in the XSL data are plotted in gray. The noise spectra from the XSL pipeline are in cyan.