Comparison between equivalent widths derived from simply integrating the lines in the given bandpasses (ΣEW_int) and from fitting Voigt profiles (ΣEW_Voigt) for all spectra with S/N >  20 and the S/N as color-coding. Note that we clipped the color range to a maximum value of 150, although we reach S/N of up to 400 for single spectra. The dashed black line provides a linear fit to the data, while the green one indicates the identity.