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Behavior of the optimal stimulation strength Iopt ∈ [0, 60] providing the minimal values 〈r〉opt shown in Figure 6 vs. the number n of OFF cycles in the rest intervals for (A) σ = 0.5 and (B) σ = 2.0 in Equation (3) and for different numbers of the stimulation sites Ns as indicated in the legend. Empty circles indicate the optimal stimulation strength Iopt at which the maximal admissible length nmax of the rest interval can be achieved for a given Ns. Other parameters as in Figure 6.
