Profiles of the Mg II 4481 Å line as observed with HERMES and FEROS during the night of 2017-04-01/02 along ~9:30 hours. All spectra have been rebinned to 0.12 Å/pixel, and the median of the night is plotted in red superimposed on each spectrum. Spectra with ‘m’ in the labels refer to those obtained with HERMES and those with ‘f’ refer to FEROS. Labels correspond to spectra from top to bottom and then the two columns from left to right.