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Fig. 8
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Comparison HST/STIS NUV transmission spectra of HD 189733 b, HD 209458 b, and WASP-121b scaled by the optical transit radius Rp (top panel) and by the Roche-lobe terminator radius RRL of each planet (bottom panel). The shaded regions denote the wavelength span of the dominant Fe II and Mg II NUV bands and lines.
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