Figure 1
From: Composite likelihood estimation of demographic parameters
Demographic model. A schematic of the two population divergence model that is fit to the joint frequency spectrum. Looking forward in time, the ancestral population splits t1 + t2 generations before the present into two descendant populations. At this time, the effective size of population 1 is assumed to be N1 and the founding size of population 2 is assumed to be α2N1. Then, after t2 generations, population 2 grows to effective size α1N1. Lastly, the effective size of the common ancestral population is assumed to be α3N1. Thus, the divergence model is governed by five parameters that need to estimated: t1, t2, α1, α2 and α3.