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Fig. 5

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ν3/η as a function of δ, in the complete Hamiltonian, for the resonance chain 1 : 1 : 2, along branch 1 of the libration centres in Fig. 4. The analytical expression (33) is plotted in grey for comparison. The colour gives the value of n1 /n3. As expected from Eq. (33), ν3 is proportional to δ far from the resonance where the eccentricities are small.

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