Graphical representation of the rate coefficient matrix ⟨σ⟩ (in cm³ s⁻¹) for inelastic Fe + H and Fe⁺ + H⁻ collisions at temperature T = 6000 K. Results are from the LCAO asymptotic model. The logarithms in the legend are to base 10. Only every fifth state is labelled. The charge transfer processes, involving initial or final ionic states, are outlined with (coloured) boxes, for ion-pair production at the upper right (red) and for mutual neutralisation at the lower left (blue).