Fig. 17

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Absorption EW in the Na I D2 line as a function of the fractional atmospheric coverage fraction per scale height, ΔA, for a sample of planets along with WASP–12 b (data adopted from Wyttenbach et al. 2015; Seidel et al. 2019; Casasayas-Barris et al. 2019; Chen et al. 2020b,a; Cabot et al. 2020; Langeveld et al. 2022; Rahmati et al. 2022).
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