Fig. 2
Examples of phase portraits for the four regions of Fig. 1. The equilibrium points are labelled as in Eq. (21). The level curves of the Hamiltonian are drawn with black lines out of the resonance island and with red lines inside the resonance. The parameters chosen are, from A to D: (γ, β) = (0.4, 0.1); (0.55, 0.15); (0.05, 0.7); and (0.8, 0.3).
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