Hydrogen ionization (top) and n = 2 populations (bottom) from a vertical slice through the simulation (indicated in Fig. 6). Left column: results for statistical equilibrium (SE). Right column: results for non-equilibrium hydrogen ionization (HNEI). The solid orange and dashed grey lines show the τ = 1 heights for both cases, and the orange crosses and light blue crosses mark regions where Hε is in emission. The dark blue line shows the relative variation of the Hε line core intensity.