Testing the effects of tree depth. Legend: The left pane shows the effect of increasing tree depth on the threshold parameter (number of species). The dots are posterior means of individual replicates. The blue line shows the expected number of species (50) and the red line shows the mean number of species diverging earlier than 4 N generations. The right pane shows the 95% HPD interval for each replicate. Gray points indicate the HPD overlapped the true number of species, black ones that it did not.