Upper panels: Mean square displacement traveled by overall initially mirroring and scattering particles vs. the time (normalized by the gyrofrequency Ω) in the parallel (panel a) and perpendicular (panel b) directions with respect to the mean magnetic fields. Lower panels: Ratio of the parallel (panel c) to perpendicular (panel d) mean square displacement between the initially scattering and mirroring particles. The initial pitch angle values are set to μ₀∈[0.1,0.2] and μ₀∈[0.8,0.9] for initially mirroring and scattering particles, respectively. The Larmor radius of particles is R_g = 0.03L_inj.