Log-log sensitivity of the damping time and of the period of the oscillations with respect to variations of different parameters of the model ℳ(5, 8, 15). The parameters are multiplied by a scale s ∈ (1/50, 50). The log(timescales) are represented as functions of log(s). Period and damping time are not represented on intervals of parameter values where oscillations are over-damped (the ratio of the damping time to the period is smaller than 1.75). Damping time is infinite and not represented for intervals of parameter values where oscillations are self-sustained. The latter intervals are limited by Hopf bifurcations where the damping time diverges.