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Fig. 9

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Projection of the phase space onto the plane (qk, Qk) with k = 1, …, 4 for the 2:1&2:1 resonant case for α = 1. Equilibria, separatrix, and last paradoxal librational curve (see Beaugé & Roig 2001) are shown in red, and the libration half-width is shown as a dotted blue line.

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