Relative signal-to-noise ratio (S/N) as a function of the wavelength for the HERMES (top panel) and the TIGRE (bottom panel) spectra. The S/N is relative to the S/N at 5410 Å, with the 5410 Å value being listed in Table A.1. At a given wavelength, the multiple crosses show the value of the individual spectra for the spectral line. The red line gives the median of these values, and the green lines the range that contains 68.3% of the data. The break in the TIGRE data around 5700 Å is due to the change from the blue arm to the red arm (Schmitt et al. 2014).