Left panel: escape CR energy versus w and q_CR. Right panel: compression ratio χ versus w and q_CR (Tycho’s case). The Rankine-Hugoniot black curve corresponds to Mach number M₀ = 500. Intensity of the data point is inversely proportional to the values of diffusion coefficient κ_CR, i.e. black asterisks correspond to κ_CR = 10²⁴   cm²   s^-1, light grey ones correspond to κ_CR = 10²⁷   cm²   s^-1.