XQ-100 spectrum of QSO J1117+1311 at z = 3.622, a representative case of the whole sample in terms of S/N. The flux is not corrected for telluric absorption (Sect. 4.1) or rebinned for display purposes. Some emission lines are marked. The red line depicts a manually placed continuum made of cubic splines (see Sect. 4.2 for details). The complete set of XQ-100 spectra is shown in Fig. B.1.