Fig. 4
Na I (8183/8199 Å) equivalent width versus spectral type diagram for our 28 late-M dwarfs and 7 Upper Sco candidate members (asterisk symbols, Martín et al. 2010). Five late-M dwarfs (star symbols) with detected lithium in this paper are shown as well as DENIS0041−5621 with lithium detection reported in Reiners & Basri (2009) and Burgasser et al. (2015).
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