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Fig. 7

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GTC/OSIRIS spectrum of W1738 co-added with the spectrum from Leggett et al. (2016) (only in the range of 10 000–10 800 Å) and compared with optical T1 and T8 dwarf spectra from Burgasser et al. (2013), an optical T9 spectrum from Leggett et al. (2012), and a Y0 dwarf spectrum from Leggett et al. (2013).
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