Resolution:
## Figure 3.
Criterion for Altruists selection. ( a) fixation probabilities π_{s} (red squares) and π_{A} (blue circles) as a function of selection pressure , for N_{f} = 100 and . Values are obtained by numerically solving eq.(8). Solid lines are theoretical values
(eqs. 13,14). Increasing N_{i} are indicated by the arrow. (b) equilibrium selection pressure for which π_{A} = π_{s} for multiple combinations of and , as a function of relative population increase, obtained numerically. The solid line
is the theoretical value (eq.15).
Houchmandzadeh and Vallade |