Properties of the NE hydrogen populations through the centre of the enhanced network region. The panels show (a) temperature in the NE simulations, (b) the departure coefficient of temperature, b_T = T_ne/T_lte, (c) the NE ionisation fraction, F_i = n_H,1/n_H,tot, (d) the number density of the first excited level of hydrogen, n_H,0,1, and departure coefficients of (e) the ground state, (f) the first excited state, (g) protons, and (h) molecular hydrogen.