Atmospheric abundance profiles of the most important species computed by Cloudy employing the composite TP profile. Top: density relative to the total density of hydrogen for neutral hydrogen (HI; black solid), protons (HII; red), molecular hydrogen (H₂; dark green), H (blue), H (violet), H⁻ (orange), and electrons (e⁻; black dashed). Middle: Mixing ratios for hydrogen (black), H₂ (black dotted), He (red), C (blue), O (dark green), Na (violet), K (orange), and electrons (bright green) asa function of atmospheric pressure. Neutral (XI), singly ionised (XII), and doubly ionised (XIII) species are shown as solid, dashed, and dash-dotted lines, respectively. Bottom: same as middle panel, but for Mg (red), Si (blue), Ca (dark green), and Fe (violet). The hydrogen, H₂, and e⁻ mixing ratios are shown in both middle and bottom panels for reference.