Collapsed structures traversed by our segments. Each panel: scatter points indicating the distributions in the impact parameter (b_⊥, sub)–accumulated dispersion measure (DM_sub) parameter space for any subhalos considered traversed by our segments, in the snapshot of redshift z described in the legend. Each scatter point colour is determined using its subhalo mass M_sub according to the mass bin ranges described by the colour bar. The total number of subhalos N_sub traversed by all segments within a given snapshot is provided in the legend.