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Distribution of selected edge costs for Infection Transmission model. Edge costs represent the inverse probability of transmission along that edge (path). The frequency of occurrence is shown on a log-scale. Each histogram shows the distribution of edge costs for the IT model of HSV2 transmission. The lowest edge costs are seen for anc-chimp -> H.habilis, anc-chimp -> P.boisei, and P.boisei-> H.erectus.
