Simulation results using the previous method with mock FRB samples. Top panel: DM_IGM, mock as a function of z_mock. The blue dots with error bars show 100 mock FRB data, where DM_IGM, mock is calculated by the previous method, assuming DM_h = 50 pc cm⁻³. We fit Eq. (9) to the mock FRB data with a free parameter of H₀. The best-fit function is shown by the solid black line, where H${}_0=78.7_{-5.7}^{+5.4}$ km s⁻¹ Mpc⁻¹. The gray shaded region indicates the line-of-sight fluctuation of DM_IGM described by Eq. (8). Middle panel: Same as the top panel of Fig. 6, but using the previous method, assuming DM_h = 50 pc cm⁻³. Bottom panel: Same as the bottom panel of Fig. 6, but using the previous method, assuming DM_h = 50 pc cm⁻³.