The start time of breakdown versus inflows classified by body size. (a) Box-plot for pedestrians with medium heterogeneity in body size, (b) box-plot for pedestrians with large heterogeneity in body size, (c) box-plot for pedestrians with homogeneous small body size, (d) box-plot for pedestrians with homogeneous large body size, (e) box-plot for pedestrians with two different body sizes.