Fig. 5.

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Distributions of the EMC bootstrap analysis for the 12 Å passband for the two transits. The “in-in” (purple) and “out-out” (blue) distributions are both centred around zero (no sodium detection), but the randomised “in-out” distribution shows a detection (black). Each distribution was fitted with a Gaussian (dashed lines). Given that each night has a different number of observed spectra, each randomisation also has a different number of counts, and thus a different scaling of the y-axis.
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