Fig. 4

Mismatch distributions based on mtDNA HVRI sequences of the white-headed langur (a) Fusui and (b) the total (Fusui and Chongzuo combined) populations. The x-axis indicates the number of pairwise differences and the y-axis indicates the relative frequencies of pairwise comparisons. Observed (solid bars) and expected pairwise differences under the constant population size model (solid line) and the population growth-decline model (dotted line) are shown. Harpending’s raggedness indices (RI) and associated P values are shown