Comparison between the energy losses of a primary proton in a uniform magnetic field obtained in simulations with the GC and NL approaches. Left panel: initial kinetic energy E_k0 = 0.25 GeV and initial pitch angles θ = 15° (A), θ = 35° (B) and θ = 80° (C). Right panel: initial pitch angle θ = 35° and initial kinetic energies E_k0 = 0.5 GeV (A), E_k0 = 1.0 GeV (B) and E_k0 = 5.0 GeV (C).