Figure 4.

Cooperative contagion with interactions defined by uncorrelated contact sequences. The system has a phase transition at $p_c\langle k\rangle =1$, which becomes discontinuous as the secondary infection probability q is increased. Symbols denote different values of q: $q=p$ (squares), $q\langle k\rangle =2$ (diamonds) and $q\langle k\rangle =3$ (circles). Colors represent different interaction radii d, changing gradually from $d=20$ (blue) to $d=100$ (red) with $\mathrm{\Delta }d=5$.