Trajectories on the (e ₁,ɡ₁ − ɡ₂) plane for example orbits of different types of drift identified in Fig. 6. Frame a presents two orbits of Type Ia marked as gray dots with black edges in the left frame of Fig. 6; Frame b presents two orbits of Type IIa dwelling in the libration domain of Ψ2 = 0 (Ψ2 = π) at ${\overline{a}}_1=3.17\text{\hspace{0.17em}AU\hspace{0.17em}}\left({\overline{a}}_1=3.18\text{\hspace{0.17em}AU\hspace{0.17em}}\right)$ in the left (right) frame of Fig. 6. Frame c presents an orbit of Type Ib, marked as dark gray dots with black edges in the left frame of Fig. 6. Frame d presents two orbits of Type IIb where the top (bottom) panel corresponds to red (blue) dots at ${\overline{a}}_1=3.17\text{\hspace{0.17em}AU\hspace{0.17em}}\left({\overline{a}}_1=3.18\text{\hspace{0.17em}AU\hspace{0.17em}}\right)$ in the left frame of Fig. 6. In frames b and d, the arrows mark the directions of evolution.