Results for a model without dust. Left: fractional abundances of ions n_i ∕n_H and electrons n_e∕n_H together with the fractional abundance of the dominant ions Fe⁺ and S⁺. Centre: perpendicular (σ_⊥) and Hall (σ_H) conductivities. Right: Ohmic (η_O), Hall (η_H) and ambipolar diffusion (η_AD) resistivities. Asymptotic trends are over-plotted in dotted lines (see text for a derivation of those expressions). Horizontal lines are added to help the reader estimate the plasma resistivities for a given proton density.