Ionization fractions of important ions at v(r) = 0.5v_∞, as a function of T_eff, for models with typical X-ray emission (triangles, f_X = 0.03, = 3 × 10⁶ K, corresponding to u_∞ = 460km s^-1), and without X-rays (asterisks). The solid lines refer to supergiant models, and the dashed lines to dwarf models. For clarity, the ionization fractions of dwarf models were shifted by one dex. For stellar parameters and onset radius, R_min, see Table 1.