Figure 1.

A genealogy simulated from a structured coalescent process with two demes, one of which has constant effective population size (clade highlighted in blue), and the other having effective population size growing exponentially (clades highlighted in red and yellow). Migration of lineages occurs at a small constant rate in one direction from the constant size deme to the growing deme. The corresponding plots at the right show a caricature of the effective population size and number of lineages through time in each clade.