Diffusion coefficient distributions with parameters: wave frequency ω/(2π) = 19.8 kHz, wave amplitude δb = 200 pT, semiband width 500 Hz, and N0 = 3000 counts/s. L-shell in panels (a)–(c): L = 1.4–2.0, L-shell in panels (d)–(f): L = 2. Five colorful lines denote the diffusion coefficient for electrons with 50 keV, 100 keV, 200 keV, 500 keV, and 800 keV, respectively. |