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. 2011 Jan 12;278(1717):2519–2527. doi: 10.1098/rspb.2010.2504

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Figure 3. — The evolutionary effects of a constraint on the growth of a high-fertility religious group. Defections increase as the group gets bigger, which limits the eventual size of this group. However, large-scale defections spread the religiosity allele R into the rest of the population. The diagram assumes: both variants: c_r/c_n = 3.0; p_R^r (0)=0.005, p_N^r (0)=0, p_Rⁿ (0)=0, p_Nⁿ (0)=0.995; a_RR^r=a_RN^r=0.3, a_NN^r=0.4, a_RRⁿ=a_RNⁿ=a_NNⁿ=0; bⁿ=0; no constraint: b^r=0, constraint: b^r =−20. Note: s_jkⁱ (t)=a_jkⁱ [1−bⁱ pⁱ (t)]. Line without diamonds, no constraint; line with diamonds, constraint.