Fig. 2

In a grid network, we start with a random distribution of 50 protectors and 50 % defectors, and 10 % of individuals infected, infectivity = 100 %, b = 5, c = 1. The left panel shows an example of the spatial configuration of protection, defection and infection. This is the pattern at time = 320 steps. The right panel shows the situation at five steps later, T = 325