Velocity plots of D i, O i, and Si ii lines (black). The best-fit synthetic spectrum is superimposed in red. Vertical lines indicate the position of the different components. The profiles for D iλ925 and D iλ972 were computed using the derived parameters but were not used in the fitting process, the former being contaminated by absorption from the Ly-α forest and the latter being saturated. We also note that the vertical lines and the velocity scale of the O iλ988 panel correspond to the strongest (O iλ988.7) of the three transitions that produce the profile.