Median cumulative distribution of the population distribution of escape fractions for each of the four models. For each model we (i) selected 10 000 parameter sets from the chains of posterior samples displayed in Fig. 6, (ii) evaluated the CDF of the distribution given by the selected population parameters on a grid of escape fractions, and (iii) computed the median of the 10 000 corresponding CDF values for each index of the escape fraction grid. The median is shown as a solid line, while the shaded region marks the 16th and 84th percentile intervals. For reference, we plot the CDF of a uniform distribution as a dashed line.