Figure 4

Discrete space. Cooperation frequencies in the TS-plane. On the left, results achieved using agents provided with constant out-degree, i.e., a scenario equivalent to ‘constant radius’ in the continuous domain. On the right, results achieved using agents provided with a variable out-degree (i.e., equivalent to variable radius)—see [30]. Parameter S indicates the payoff obtained by cooperators that face defectors that in turn gain a payoff equal to T (when facing cooperators)—see matrix 1. Colors indicate the averaged degree of cooperation achieved by the population. We recall that red indicates strong cooperation, while blue defection (i.e., no cooperation).