Fig. 3
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Air mass and signal-to-noise ratios of the CARMENES observations (combined spectra). Black triangles indicate the S/N in the region of the helium triplet (10 820.0 Å < λ < 10 870.1 Å), while the gray squares represent the S/N in the region of the H I 6565 Å line (6550.0 Å < λ < 6580.0 Å). The red dots show the air mass during the observation.
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