Fig. 4

Population size changes in host (dashed) and parasite (solid) are generated for the GFG model with the same parameter set as in Figure 2. The average number of pairwise differences scaled by θ,Π₂₀(t)/θ, is plotted against time for our analytical framework based on the diffusion approximation of the Wright-Fisher model (black) and for our simulation approach (red) with a fractional overlap of 1−d (d=0.9) between successive time steps. For the simulations, computational time steps are set to 0.001, a genome-wide mutation rate of μ=1 is applied, and each value is obtained as an average over 10 repetitions