Fig. 1
Out-of-transit spectrum of AU Mic, zooming on the spectral region containing the Na I doublet at 5891.7 and 5897.6 Å, and the He I line at 5877.2 Å. The dashed lines indicate the central positions of these three lines. The red spectrum is the raw spectrum after DRS data subtraction, and the black spectrum results after the Molecfit telluric correction.
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