Level curves of the secular Hamiltonian for the current and past evolution of the object 2014 FZ₇₁. Two smooth trajectories are considered, divided by a separatrix crossing. The constant parameter η₀ is given in Table 1, whereas 2πJ is given above the graphs (au² rad² yr^-1). The current orbital elements of 2014 FZ₇₁ result in the left phase portrait a). Following the level curve towards the left (past evolution), the blue spot shows the position of the previous separatrix crossing undergone by 2014 FZ₇₁. The right graph b) presents the secular model for the past evolution of 2014 FZ₇₁. The blue spot shows its position at the transition to its current state (same as graph a)).