Left panels: the dependence on the inner eccentricity (e1) of the amplitudes Aℳ, of the functions ℳ, describing the long-period dynamical part of O−C for specific values of other orbital elements. To compare the ℳ and terms, the former should be multiplied by e2. The thin lines (indexed by “1”) refer to the first-order approximation, and the thick ones (index “6”) to the sixth one. Right panels: the corresponding A1,2,3 amplitudes of the trigonometric representation (Eq. (32)) of the O−C for two different outer eccentricities (e2 = 0.3 and e2 = 0.7) (g2 was set to 0°).
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