Two illustrative particle orbits starting at the same initial position x = 0, y = 4.2 and with the same initial energy (5.5 keV), but different initial pitch angles. Orbit 1 (red) has an initial pitch angle of 87.3° (i.e. close to 90°) and hence stays close to the middle of the CMT at all times, whereas orbit 2 (black) has an initial pitch angle of 160.4° and has mirror points close to the lower boundary.