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Fig. 6
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Spectra in the K-band range of late-type stars in the field. Colourised vertical lines indicate the Βrγ absorption line (in green), Na I γγ2.2062−2.2090, and γγ2.3350−2.3390 and Ca I γγ2.2614− 2.2631−2.2657 (in blue), and CO bands at 2.2935, 2.3227, 2.3524, and 2.3830 μm (red).
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