Sketch of the different regions in pitch angle vs. time evolution in a CMT. The red curve represents the time evolution of the loss cone angle α(t), which starts at a value α_init and then increases with time towards an asymptotic value α_∞. The blue hatched region represents the orbits with pitch angles less than the loss cone angle which are lost. Orbits with initial pitch angles greater than α_∞ (brown shaded region) remain trapped (although see discussion in main text). For orbits with initial pitch between α_init and α_∞ (green hatched region) the outcome depends on the relative importance of Fermi vs. Betatron acceleration.