Level column densities, divided by their degeneracies, N_i/g_i, plotted as a function of level energy, T_i, for the H₂ lines measured in HH7. They are normalised to unity for the (v, J)=(1, 3) upper-state level at 6952 K, which emits the 1–0 S(1) line. The two blue points (in the lower right) are for the newly analysed 2–1 S(27) and 1–0 S(29) lines. The dashed red line shows the best two-temperature LTE fit, as described in Sect. 4.