Figure 7.

The (signed) relative error from assuming the sample frequency spectrum of a quadrallelic site is proportional to (n_bn_cn_d)⁻¹ [equation (48)]. Here, the sample size is n = 20 and the mutation parameter is θ = 0.01. Shown are relative errors for a representative slice through the simplex of configurations, defined by fixing n_d = 2. Positive relative errors are shown in dark grey, negative relative errors in light grey.