Table 3.

Comparison of exact solution (E) for the variances of population gene frequencies in a 100-stone stepping-stone model for n = 100, m_∞ = 0.001, m = 0.1, N = 250, and p̄ = 0.2 with the approximations of this paper (F1 and F2). Approximation F1 uses the value of σ² averaged over all populations. Approximation F2 uses a value of σ² calculated for that population. As the migration pattern is symmetric, only values for the first half of the lattice are shown.

population	E	F1	F2
1	0.01900	0.01968	0.01870
2	0.01691	0.01744	0.01679
3	0.01534	0.01575	0.01532
4	0.01416	0.01447	0.01419
5	0.01328	0.01351	0.01333
10	0.01126	0.01139	0.01129
20	0.01066	0.01061	0.01066
30	0.01062	0.01057	0.01062
40	0.01062	0.01057	0.01062
50	0.01062	0.01057	0.01062