(a) D(θ) vs. θ for 112 FRBs. Error bars indicate 95% confidence intervals. The dashed line is the fit to the data points at small θ with the fitting function and parameters given by Equations (17) and (18). (b) Same as (a), but for ﹩{D}_{E}(\theta )﹩. The dashed line shows the fit (Equation (17)) with ﹩\alpha =1.13\times {10}^{4}\pm 1.31\times {10}^{4}﹩, ﹩\beta =1.60\pm 0.43﹩, and ﹩\gamma =4.17\times {10}^{4}\pm 6.50\times {10}^{4}﹩, where the uncertainties are given at 68% confidence.