Atmospheric mixing ratios obtained for metals. Top: mixing ratios for hydrogen (solid black line), H₂ (dotted black), He (red), C (blue), O (dark green), Na (magenta), K (orange), and electrons (bright green). Bottom: same as the top panel but for Mg (red), Si (blue), Ca (dark green), and Fe (magenta). The hydrogen, H₂, and e⁻ mixing ratios are shown in both panels for reference. Neutral (XI), singly ionised (XII), and doubly ionised (XIII; present just in the bottom panel) species are shown as solid, dashed, and dash-dotted lines, respectively.