Estimates of DM_host for the 12 FRB hosts. The main panel shows each contribution of our empirical direct estimate (DM${}_{\mathrm{host}}^{\mathrm{direct}}$ in black points, DM${}_{\mathrm{host}}^{\mathrm{halo}}$ in dark blue and DM${}_{\mathrm{host}}^{\mathrm{ISM}}$ in light blue). The upper panel is the histogram for DM${}_{\mathrm{host}}^{\mathrm{direct}}$. The mean and the standard deviation (±1σ) of the distribution are represented by the vertical solid and dashed lines, respectively.