Top: HAT-P-7b’s (T_gas, p_gas) structure (left) and degree of ionisation, f_e, (right) of the 97 1D profiles. The red lines correspond to the dayside (ϕ = 60.0°…0.0°…300.0°). The blue lines are the nightside profiles (ϕ = 120.0°…240.0°). The grey solid line corresponds to the evening terminator profile (ϕ = 90.0°). The grey dashed lines are the morning terminator profiles (ϕ = −90.0°or 270.0°). Bottom: equatorial slice plots of the thermal degree of ionisation (θ = 90^o – north, θ = −90^o – south,left – nightside, right – dayside). The green dashed lines indicate where the two slice plots overlap. The dashed black line marks the homopause line and illustrates where f_e = 10⁻⁷ in the atmosphere.