Limitation in plot_planes (get_all_atom_planes_by_zone_vector)
The function get_all_atom_planes_by_zone_vector can take a list of zone vectors, but the length of the list must be longer than 1. The effect of this is that it is not possible to use plot_planes for only one zone vector.
Currently, plot_planes is set such that the planes for all zone axes are found and added to the signal (plotting only a sub-set of zone axis is not possible).