Atmospheric absorption spectra at the centre of the transit as a function of wavelength in the stellar rest frame, for synthetic stellar spectra containing CLVs. Upper panel: absorption spectrum of the planetary disc only. Middle panel: absorption spectrum of the planet with a thermosphere. The black dashed curves were computed using F_out. Blue dashed curves were computed using F_loc(T₀). Lower panel: quantities used to compute the absorption spectra. We multiplied F_out by the ratio between the occulted surface and the surface of the star to bring it to the level of F_loc and make the comparison easier.