Ratios of total injected particle fluxes with active (F_CSP) or inactive (F_noCSP) cross-shock potential. We show results for semi-analytical integration (curves) and Monte Carlo simulations (symbols). Presented shock-normal velocities are V_s = 1500   km   s^-1 (left) and V_s = 2000   km   s^-1 (right). Simulations without downstream propagation of particles are designated with ℬ = 0, whereas simulations where particles isotropise through downstream scatterings are designated with ℬ > 0. The flux differences for reflected particles in the Monte Carlo simulations (⋄ , +) are due to statistical uncertainties. For κ = 15, reflected particle fluxes are too low to be visible.