Top: one dimensional X-shooter spectrum around the DLA region (black). The best Voigt-profile fit of the DLA absorption is overplotted in red, together with the associated error (dotted red). The unabsorbed QSO continuum is represented by the dashed grey curve. Note the presence of the Ly β+O vi emission line at λ ~ 4020 Å (indicated by a short vertical line). Middle: the corresponding three 2D spectra. From top to bottom: PA = 0°, 60°, and –60°. The short vertical segment indicates the spatial scale of the y-axis. Bottom: the three 1D spectra in the region around the double-peaked Ly-α emission (green: PA = 0°; blue: PA = 60°; red: PA = –60°).