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Fig. 10

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Size of the measured He I absorption signal, normalised to the atmospheric scale height computed considering the planetary parameters listed in Table 3 and a mean molecular weight of a pure hydrogen atmosphere, as a function of the incident stellar XUV flux (in logarithmic scale), with the symbol size indicating the planetary surface gravity. The uncertainties on the stellar XUV flux are set to be equal to a factor of two (see text). Downward arrows indicate upper limits.

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