Comparison of the HERMES spectra (blue and grey lines) with the smoothed Kurucz spectrum (red line) around the Ca H&K lines (top left panel), the Mg-triplet (top centre panel) and the H_α line (top right panel). The bottom panel shows the region in the infrared around the Paschen line at 887 nm. The differences between the three spectra around H_α and the Paschen line originate from the contamination casued by telluric lines. In the infrared, several weak telluric emission lines are also seen.