One of the orbits with lowest predictabilities is HC2 when the halo has an orientation of φ = 115.0 and a flattening of q_z = 1.25. This trajectory in the physical configuration space (x,y,z) is shown in the leftmost panel, and the corresponding Poincaré section y − v_y with plane x = 0 and v_x> 0 is shown in the rightmost panel. This orbit has λ = 0.0 and h = 10^-4, corresponding to a case of a regular orbit with a very low predictability, linked to a very stiff problem.