The four intervening systems along the GRB090926A sightline. Top left: intervening 1 at z = 1.9466; top right: intervening 2 at z = 1.7986; bottom left: intervening 3 at z = 1.7483; bottom right: intervening 4 at z = 1.2456. The first three systems feature the C iv doublet and Lyα. System 4 shows Mg i and Mg ii, with the λ2852 transition and λ2796 – λ2803 doublet, respectively. Mg i is marginally detected (2.7σ). Solid lines represent our best-fit model (see also Table 4).