Relative abundances of the main ions of the atmosphere of Triton: (a) Most abundant ions that are the focus of this study – blue solid line with circles for C⁺, orange dashed line for N⁺, green dash-dotted line for N₂⁺, purple dotted line for H⁺, thin brown solid line for CO⁺, thin dark blue dashed line for N₂H⁺, and red solid line for electrons. (b) Most abundant ions below 175 km.