In Fig. 6, the time evolution of the pitch-angle Fokker-
Planck coefficient is illustrated. The typical double-hump structure
known from analytical theories (cf. Appendix A) is exhibited;
for later times, in contrast, the characteristic 1/t dependence
shown in Eq. (2b) dominates. Additionally, the shape of Dμμ is
strongly modified, thereby resulting in a drastically increased χ2
for the comparison between simulation and analytical theory as
shown in Fig. 7