Figure 2.

Contour map of the fraction x of replicators as a function of $(\lambda ,\Lambda )$, for a carrying capacity $K=100$, where $\lambda$ denotes the average number of molecules per compartment and $\Lambda$ the relative growth rates of the parasites with respect to the host. The dotted line is the contour of $x=1$, which marks the border of the pure replicators phase (the red region). Above this line, a coexistence region exists between the two species at a fraction of replicators indicated by the color scale.