Gas-phase concentrations q(x) = n_H2O∕n_<H> (with n_x (cm⁻³)), also called mixing ratio. Top left: 1D structures of the H₂O distribution on HAT-P-7b. We follow the same colour code like in Fig. 3: blue – nightside, orange – dayside; light blue – morning terminator (ϕ = 270°), light orange – evening terminator (ϕ = 90°), black-dashed – substellar point (ϕ = 0°), black-dot-dashed – anti-stellar point (ϕ = 180°). Top right: global H₂O map at p_gas = 10⁻³ bar. Bottom left:2D cut through the equatorial plane. Bottom right: 2D cut along the terminator. The dashed green lines indicate where these two slice plots overlap. For the viewing geometry of the slice plots in the bottom row, please see Fig. A.2.