(a) DM_E distribution for the entire FRB sample. The thick solid line shows the kernel density estimate of the distribution. The peak of the distribution at ﹩{\mathrm{DM}}_{{Ep}}=306.3﹩ pc cm⁻³ is indicated by the vertical dashed line. (b) DM_IGM–z relation (solid line). The dashed line marks ﹩z\approx 0.36﹩ corresponding to DM_Ep.