Left: Distribution of absolute values of RM_eg as a function of FRB redshift in observer frame. The black dots show the FRB sample analysed in this work, whereas the grey triangles are the DSA-110 subsample taken from Sherman et al. (2023) and the blue diamonds illustrate the FRBs from the Mannings et al. (2023) sample, which are not part of this work. Right: Distribution of RM_eg values in rest-frame of FRB hosts as a function of the corresponding ${\mathrm{DM}}_{\mathrm{host}}^{\mathrm{direct}}$ and ${\mathrm{DM}}_{\mathrm{host}}^{\mathrm{ism}}$ values from Bernales-Cortes et al. (2025) (only for sources for which corresponding MUSE data are available).