Root Height distribution in two simple cases. The distribution of the root height in two simple cases. The values from 20,000 simulated trees in shown in blue, while the theoretical values are shown by the red line. (A) 2 species a and b which diverged T=2 time units in the past, with a constant migration rate of 0.1. Population size is constant, N
=2 and N
=1. 1 lineage in each species. (B) Same settings, with 2 lineages from a and one from b.