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. 2015 Mar 24;10(3):e0120343. doi: 10.1371/journal.pone.0120343

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© 2015 Cimini et al

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Fig 7 — Here with γ = 2.5, m = 9, n = 10⁴ and various β (again, these results are independent on the specific value of n): Stationary cooperation levels ρ _∞ vs α for PI (a) and BR (b) dynamics. The vertical solid line identifies the value of α _c = c/Θ₂(0).