Ionization fractions of ions most affected by Auger ionization, at different depth points. All models have typical X-ray emission parameters (f_X = 0.03 and = 3 × 10⁶ K). The triangles represent models including Auger ionization (standard approach, similar to Fig. 8), and squares models without (i.e., only direct ionization has been considered). Solid lines refer to supergiant models, and dashed ones to dwarf models. For clarity, the ionization fractions of dwarf models have been shifted by one dex.