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Fig. 4.


Reconstructed intrinsic Lyman-α spectrum of K2-18 (green) and the average Lyman-α profile as observed with HST/STIS (black bars). The red (blue) curve shows the inferred observable spectrum with (without) instrumental convolution and the shaded region represents the 1σ uncertainty for the red curve. The dotted curve shows the inferred ISM absorption profile.

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