Low- (R = 180) and medium- (R = 580) resolution VIMOS spectra of Ion2 in panels a) and b). The two spectra overlap in the range (4800−6800 Å). Several typical low- and high-ionization atomic transitions are reported. The Lyα emission in both spectra and the Lyβ and Lyγ absorption features in the low-resolution spectrum (panel a)) are clear. The Lyman continuum blueward of the Lyman limit (LL) is indicated in panel a). Panel b) zoomed one-dimensional Lyα line extracted from the medium-resolution spectrum (R = 580). Its atypical blue asymmetric tail is clear. The insets in panel b) show the two-dimensional Lyα line at first (top) and second (bottom) order. The latter, with double spectral resolution, R ≃ 1200, clearly shows the double-peaked structure of the line. In panel c) a zoom-in of the position of C iii]λ1909 is shown at z = 3.212. The insets in panel d) show the region in which the C ii]λ1334 absorption line would lie: absorptions consistent with noise fluctuation are present (the gray stripe indicates the position of the sky emission line, 5577 Å).