Relative abundances of the main neutral species in the atmosphere of Triton: (a) Relative abundance of N₂ (green solid line), CH₄ (orange solid line with circles), CO (red dashed line), H₂ (blue dash-dotted line), and H (dark blue dotted line), (b) Relative abundances of N(⁴S), (black solid line), N(²D), (black dotted line), C (gray dash-dotted line), and O(³P), (cyan dashed line). We only give the O(³P) profile as the abundance of O(¹D) is negligible.