Visualised transfer of quasi-thermal (left, κ = 15) and non-thermal (right, κ = 2) particle flux densities dℱ/(dv_∥   dv_⊥) across a shock of velocity V_s = 2000   km   s^-1 with four different shock-normal angles. Blue contours depict the incident transmitting flux, red contours depict the reflected flux, and red solid contours the transmitted downstream flux at one magnitude intensity intervals. The black semicircles depict downstream speed thresholds for statistical return probabilities of 0% (dashed) and 25% (dotted), and the black-green dashed curve represents the reflection threshold.