Lorentz factor distributions for background electrons (green population), for various simulations with m_i/m_e = 25 or 1, in the final state. Times are for all simulations, except for ω_ce/ω_pe = 1 (), and for ω_ce/ω_pe = 6 (). Notations are abbreviated: , , σ_e stands for , and V_A for (with θ = arctanB_G/B₀). Unless specified, . The power-law indexes are p. The precise setups are reported in Table 1 for each σ_e. The light-green curve (σ_e = 83, V_A = 0.9) is the same on the left and right panel, and is the final state of the simulation of Fig. 1.