Numerically calculated pitch-angle Fokker-Planck coefficient, D_μμ, as a function of the pitch-angle cosine, μ, for three different values for the normalized rigidity, R. For comparison, the analytical results from QLT and SOQLT are shown as solid blue and dashed red lines, respectively. The relative turbulence strength is chosen as δB/B₀ = 10^-2. (This figure is available in color in electronic form)