Redshift evolution of the median and width of the DM and RM PDFs. Top: median of DM_host,_rf as a function of redshifts for all galaxy types. The shaded regions correspond to the 1σ and 2σ width of the distributions. The power law fit is plotted as a dashed black line. For comparison, we also plotted the results from Zhang et al. (2020), in the case of host galaxies like the host of FRB180916 (a), galaxies similar to the hosts of non-repeating FRBs (b) – hosts known at the time of Zhang et al. (2020)’s paper, and galaxies similar to the host of the repeating FRB121102 (c). For further details on the comparison, see Sect. 4.2.1. Middle: median of RM_host,rf as a function of redshift. The shaded regions correspond to the 1σ and 2σ width of the distributions. Bottom: 1σ width of the distributions of RM_host,rf (w_RM,rf) as a function of redshift, and the curved power law fit (black dashed line). The errors are from the bootstrap method.