Comparison of pressure profiles of neutral densities (left) and temperature (right) in the thermosphere of HD 209458b (red) and HD 189733b (blue) based on quiescent stellar spectra for model A with a cool lower atmosphere and model B with a hot lower atmosphere (see text). In panels a) and c), the solid lines represent atomic hydrogen densities, whereas the dashed lines are molecular hydrogen. The dotted horizontal black line in each panel represents the pressure level corresponding to 2.95 R_p, the lower boundary of the Bourrier & Lecavelier des Etangs (2013) model.