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Enhancement, R[ψA](NhSp), of sperm competitive advantage (ψA) for a range of the half-sperm number (NhSp) compared to that in one-on-one competition. The cyan and green lines represent case i and case ii, respectively. All other lines represent case iv. The cases with α = 1, 2, and 3 are colored red, blue, and purple, respectively.
