Comparison of formulas put forward to place upper limits on the host galaxy screen distance from the FRB. For bins of resolution power, the median is shown as a solid line, the mean is shown as a dashed line and the shaded regions correspond to the central 68% of the data distributions. The corresponding modulation index from Eq. (7.4) is shown at the top. The upper limits by Main et al. (2022) and Ocker et al. (2022) were derived for m_MW ≈ 1 and are shown here outside of that regime.