Top panel: apparent column density profiles of high-ion and Fe ii absorption in the z_abs = 2.47621 PDLA. Several of the profiles have been scaled by the factors shown in the legend, to allow inter-comparison with the other lines. The O vi profile is only shown at velocities where the two O vi lines overlap; upper limits for O vi are shown at other velocities, using whichever of the two doublet lines gives the stronger constraint. Middle panel: C iv/O vi apparent-column-density ratio as a function of velocity; in pixels with upper limits on O vi, lower limits on the ratio are given. Lower panel: C iv/Si iv apparent-column-density ratio as a function of velocity. The mean (solid lines) and standard deviation (dashed lines) of the logarithmic ratio in each component are shown in red.