Figure 3
The expected frequency of mutant alleles (unfolded frequency spectrum) of allele frequency X in a neutral model of two populations exchanging M = 1 migrants per generation, assuming: (a) a sample of size n = 20 chromosomes and no ascertainment bias; (b) an ascertainment sample of two chromosomes from each population; and (c) an ascertainment sample of four chromosomes from Population 1.