Stable (QS_h) and unstable (HS) inclined periodic orbits in the 3D-CRTBP with i_d = 30° (panel a) and i_d = 50° (panel b). These orbits belong to the 3D families F^I with periodic orbits symmetric with respect to the xz-plane and G^II′ with periodic orbits symmetric with respect to the x-axis, (both families are shown Fig. 6). These 3D families may either bifurcate from the 2D family I (or I′) or from the 2D family II (or II′) shown in Figs. 3-4. Presentation as in Fig. 1.