Total fluxes of H₂ rovibrational lines (top panels) and CH⁺ rotational lines (bottompanels, summed up to the J = 10 → 9 transition)emerging from shocks propagating at 5 (left panels), 10 (middle panels), and 20 (right panels) km s⁻¹ in different environments, for a buffer visual extinction . The non-varying parameters are set to their standard values (see Table 1). All fluxes are normalized to the input kinetic energy flux of the shock . The results are displayed simultaneously as colour maps and fence plots at fixed densities of 10² (yellow), 10³ (red), 10⁴ (blue), and 10⁵ (green) cm⁻³. White lines on the colour maps indicate contours of constant G₀∕n_H ratio.