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The waiting time to the first observation of sterile mutations, τup1. (A) The distribution of τup1 shows that sterile mutations were initially observed earlier in the small Ne populations (blue bars) than in big Ne populations (yellow bars). (B) Late-occurring steriles spread slightly slower than early-occurring steriles (P = 0.0016, Spearman's rank correlation). The black line is the best-fit linear regression (Pearson's) to the data.
