Possible secular trajectories for the HD 196885 system seen in the plane (top), and in the plane (bottom). We show the trajectories in the restricted quadrupolar approximation (left) and using n-body numerical simulations of the real system (right). The dashed black curves in a) separate zones of libration and circulation of the angle . The black crosses indicate the location of Lidov-Kozai equilibrium points for this system. N-body numerical integrations in the () plane b), and in the () plane d), preserve the same colors for the initial conditions in the restricted problem.
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