DM accumulated within individual snapshots due to traversing collapsed structures. Left panel: statistics (median, interquartile range) describing the average accumulated within snapshots by sightlines traversing our subhalos in the rest frames of the snapshots, and therefore the rest frames of the subhalos. Right panel: these values weighted by redshift, effectively describing the average DM that would be observed by an observer at z = 0 due to these subhalos. Colours indicate the mass ranges described in Fig. 9.