Hα, Hβ, and Hγ transmission spectra (light gray, and binned by 10 × in black circles) in the planet rest frame and in velocity space (the continuums are set to the white light transit depth δ = 0.00677). The best PAWN models, in the case of a hydrodynamically expanding thermosphere, and in the Boltzmann equilibrium, are shown in blue. The retrieved temperature is K, and the mass loss rate is g s⁻¹. The best PAWN models, in the case of a hydrodynamically expanding thermosphere, with a LTE departure, are shown in dashed red. The retrieved temperature is K, the mass lossrate is g s⁻¹, and the common LTE departure coefficient is .