Fig. 2
Hamiltonian level curves for a fictitious planetary system composed of a star with m0 = 1 M⊙ and two planets both with mass 0.001 M⊙, mutual inclination of 20°, e1 = 0.5, and e2 = 0.9 located in 3:2 resonance with a1 = 1 au. The stable equilibrium points are shown with an O and the unstable point is shown with an X. We apply Eq. (28) and predict a total width of 0.048 au in a2.
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