The main ionization contributors along a disk wind streamline launched from 1 AU, for our Class 0, Class I, and Class II models (top to bottom). The left panels plot the fractional abundances relative to H nuclei of molecular ions; the right-hand panels plot abundances of atomic ions and negative species (electrons and PAH⁻). The total ionisation fraction, X(i⁺) ≡ n(ions)/n_H, is also plotted as a thick black curve.