The C ii and Si ii (top left panel), O i and O vi (top right panel), Mg i, Mg ii, Al ii and Al iii (bottom left panel), Fe ii (bottom right panel) absorption features. Solid lines represent the two Voigt components, best-fit model. Vertical lines identify the component velocities. The zero point has been arbitrarily placed at the redshift of the red component (z = 2.1071). The O vi features are blended at blue wavelengths. Component I of Al iii has been slightly shifted for an adequately fit.