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Fig. 3

image

Mid-transit (T2-T3) transmission spectrum around the HeI triplet for nights 1, 2 and 3, from top to bottom, respectively. The black line shows the spectral regions unaffected by OH lines, while the red line marks the spectral regions affected, and corrected for, OH emission. The blue vertical lines mark the helium triplet line center positions. Note the different absorption scale between night 1 and nights 2 and 3.

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