Fig. 11. Level curves of the resilience for an irreversible lake (b = 0.4) (L_min = 0.1, L_max = 1, P_max = 0.5, and VL_max = 0.1). The cost functions used to evaluate resilience are γ in the first row and λ in the second. The anticipated disturbance is a sudden increase in the concentration of phosphorus. Its maximal intensity is α = 0.15. The resilience of two states that belong to the same line are equal. The subset of Viab(K) where resilience is infinite is shaded light gray. The set where resilience is null is colored dark gray.