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Fig. A.1.

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Temperature profile (radial coordinate in units of planet radius) in a hydrodynamic flow for different lower boundary values H2O/H2 with a stellar EUV flux of , Mp = 5M⊕, and g = 4 m s−2, where
is the present EUV flux at Earth. Sonic points are marked by filled circles and the exobase is marked by triangles.
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