Full HIRES spectrum of GRB 080810. Absorption from the host system complex around z = 3.35 is marked in red, while a selection of the strongest intervening systems is marked in blue. For clarity, not all Ly-α forest lines are marked. Absorption corresponding to telluric lines is plotted in grey. The Lyman limit is clearly visible just short of 4000 Å, as is the termination of Ly-α absorption at 5300 Å.