Figure 6.

Representation of the domain Ω (red). A: The probability for no activation at time τ = 10min as a function of parameters λ and k_-1. Other parameters are those of table I B : The mean time to threshold as a as a function of parameters λ and k_-1. Other parameters are those of table I. C : The curve 1 is given as the level line associated τ = 10 min in figure B. The curve 2 is the level line associated with the probability P given by P(τ) = 0.95 in figure A. These two curves determine the domain Ω satisfying conditions C1 and C2.