Figure 3

Half-approach period τ = ln 2/ r , in the units of the mutation rate, in the case of four alleles, under different modes of selection. S₃ = 0, 1, 2, 4, and 8 (A - E). S₄ = 0, 1, 2, 4, and 8 (red, orange, green, light blue, deep blue).