Null points detected based on the simulated spacecraft trajectories as described in Appendix A. In the top panel is the exact distance from the centre of the spacecraft tetrahedron to the nearest null (|R|), its type, and its number based on Table A.2. The second, third and fourth panels show the results from the FOTE method with a tetrahedron with S = 0.025, S = 0.12, and S = 0.4, respectively. The bottom panel shows the results of applying the Poincaré index method for the large-scale tetrahedron with S = 0.4.