Example of the process to remove telluric emission and absorption lines from the stellar spectra. Left panel: the original spectrum is shown in red; the isolated contamination, taken as the average of 3 sky spectra that were observed simultaneously with the stellar spectrum, is shown below in blue; and the result after subtraction is overplotted in black. Right panel: the spectrum, now with the telluric emission line removed, is shown in red; the telluric absorption line template, scaled and shifted vertically to facilitate a comparison with the stellar spectrum, is shown below in blue; and the final decontaminated spectrum is overplotted in black.