Figure 4.

λ _s (as in Eq. (5)) as a function of the frequency mismatch ω–ω ₀ and the strength C of the mean field for the case A = B = 1, α = β = 0.3π. The synchronous solution is stable if λ _s < 0. The black line represents the stability border (λ _s = 0) for γ = 0.2π (a) and γ = 0.6π (b). The red crosses in (a) and (b) show the parameters used in Fig. 3a and b, respectively.