Amplitude of the variations of the argument of periastron of the inner planet ωb∕ref c, computed in the external body’s reference frame for every initial set (ic, Δ Ω). An amplitude of 180° corresponds to a circulation of ωb∕ref c. Zones of libration exist for initially non-coplanar configurations. These regions are identical to the low-amplitude high-eccentricity zones of Fig. 4.
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