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Comparison of the SFS between PReFerSim (gray) and the diffusion approximation (black; δaδi) for complex demographic models with purifying selection. Top: the SFS are similar in a sample of 2000 chromosomes. SNPs with counts greater than 22 are combined in the last bin. Bottom: SFS for a sample of 24 chromosomes. See Supplementary Text for a description of the model parameters
