Fig. 2.
Neutral H mole fraction profiles resulting from the measured He(23S) and Lyα absorption spectra for HD 189733 b, HD 209458 b, and GJ 3470 b with the representative H/He ratios of 99/1, 98/2, and 98/2, respectively. The grey shaded areas correspond to the temperature and mass-loss rate ranges (symbols) in Fig. 1. The thicker solid lines are the mean profiles. The vertical dashed lines indicate the mean Roche lobes.
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