Figure 3:

Normalized mean coalescence times on the X chromosome under a sib-mating model. Coalescence times are plotted as a function of the number of mating pairs (N) and the proportion of mating pairs that are sib mating pairs (c₀). (A) $\mathbb{E}\left[T_f\right]/(3N)$, Eq. 20. (B) $\mathbb{E}\left[V_{mf}\right]/(3N)$, Eq. 23. The dashed line at $\frac{1}{3}$ represents the minimal mean coalescence time under consanguinity, achieved at c₀ = 1.