Remodelling of the hydrogen Lyman α absorption line in this absorption system. The absorption line profile is overlayed by the model (red) which is based on the measured O i column density and the assumption that [O i/H i] = − 1.56 in every component. The vertical, dotted lines indicate the velocity components of the weakly ionised metal species. The shape of the absorption line is reproduced although the outer, weaker components do not give strong constraints on N(H i).