Dominating ions at the dayside, the nightside and at the two equatorial terminators of HAT-P-7b (ϕ = 90^o – evening, ϕ = −90° – morning). nI is the number density for the gas-phase atom, nII is the number density for the singly ionised ion in the gas-phase. The black dashed lines indicate where nII/nI = 1. Above this line, the element is ionised, and below this line they appear neutral.