Reduced X-shooter spectra for a range of spectral types of single-star supergiants (top) and dwarfs (bottom). For illustration purposes, the flux of each spectrum was divided by its mean value and an arbitrary offset was added. The grey regions correspond to the UVB-VIS common wavelength coverage (∼ 5500 Å), a gap due to bad pixel masking (∼ 6360 Å), and telluric absorption. Minor manual treatment to remove strong cosmic rays was performed.