Fig. 10
Error bars for the estimated hydrogen escape rate and EUV ionizing flux for HD 209458b. The best fits (at the 1σ level, striped zones) are obtained in two regions: escape rate Ṁ ~ 109 g s-1 and ionizing flux Fion ~ 3 F⊙, or escape rates above 6 × 109 g s-1 and ionizing fluxes Fion ~ 4 F⊙. High escape rates are associated to high ionizing fluxes.
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