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Fig. 1

image

Continuum normalized observed spectra (black) and best fit synthetic spectra (red) for three stars with different stellar parameters and SNR including 2M19011653+4510080, 2M18583782+4822494, and 2M18541513+4202326 from top to bottom, respectively. 2M19011653+4510080 has Teff = 4544 K, log g = 2.54 dex, [Fe/H] = +0.53 dex, SNR = 874 pixel-1, 2M18583782+4822494 has Teff = 4740 K, log g = 2.54 dex, [Fe/H] = –0.26 dex, SNR = 225 pixel-1, and 2M18541513+4202326 has Teff = 4969 K, log g = 2.44 dex, [Fe/H] = –0.82 dex, SNR = 134 pixel-1.

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