Top panels: dynamical maps of inclined configurations with Ω = 90° with q = 1, 0.5, 0.2 (from left to right). The colour scale corresponds to the eccentricity variation Δe of the orbit. The continuous red lines are defined by Eq. (1) and correspond to the analytic limit between polar and prograde or retrograde orbits. Bottom panels: longitudinal cuts of the dynamical maps at i = 90°. The amplitude of Δe (Δi) is shown in red (blue). The grey shaded areas correspond to chaotic orbits with ⟨Y ⟩ ≫ 2.