Cooling integrated along the shock length, normalised by kinetic power in weakly magnetised shocks, for n_H = 10² cm^-3. The solid line with triangles shows the fraction of the power that is transferred into a flux of magnetic energy. In this figure, H₂ cooling incorporates the cooling from 200 lines between the 149 H₂ levels included in the simulation, whereas Fig. 3 considers only six individual lines amongst the lowest levels of H₂.