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. 2013 Jan 17;9(1):e1002868. doi: 10.1371/journal.pcbi.1002868

Figure 1. Cooperation level on the T-S plane without the punishment mechanism (p = q = 0).

Figure 1

The dashed line indicates the edge-curve λ where the cooperation level reaches 50% (being larger than 50% above the line). Under this scenario that only accounts for the impact of structure in the evolution of cooperation, we obtain Ω = 0.49.