Fig. 1
Level curves of the Hamiltonian in the plane (e1cosΔϖ,e1sinΔϖ). a) Quadrupole expansion with g1 = 5′′/yr. b) Octupole expansion with g1 = 5′′/yr. c), d), e), f) expansion up to the order n = 20 with g1 = 2.5,3.6,4.0,5.0′′/yr, respectively.
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