Fig. 6

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Mock absorption spectrum generated with an in-transit spectrum from the observation day January 26, 2023. Top panel: the blue points represent the simulated absorption spectrum and the corresponding best-fit is shown as a red line. The planetary signal, used as input for the simulation, is shown as a yellow line and is shifted vertically for display purposes. The gray vertical lines indicate the position of the He triplet. A visual inspection reveals a strong agreement between the best-fit line and the expected results. Bottom panel: residuals for the best-fit line are shown in red.
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