Velocity distribution of f_e(v_∥) for the test-particle electron population downstream of the shock transition at t ω_c = 400 for a simulation (T) with v₀/v_A = 10. The center of the distribution is described by a Maxwellian well (dashed-line). A suprathermal tail is clearly visible. The relative amplitude of the tail at v = 150 v_A is significantly higher, approximately 5500 times, than the value obtained for the Maxwellian core electron distribution (electron fluid).