Differential particle number density for the energy bin centred at γ = 4.2 × 10³ (upper panel) and γ = 1.1 × 10⁷ (lower panel) in analogy to Fig. 1. The lower energetic distribution is mainly populated by Maxwellian electrons, whereas the higher energetic distribution is dominated by power-law electrons. For clarity we show only five orders of magnitude below the highest value. The blue regions correspond to those with lower values.