MG (left panel), MJ (middle panel), and G − J (right panel) relations vs. spectral type of the known ultra-cool and brown dwarfs found in Gaia DR2. 10 stands for L0, and 20 for T0. The squares show the subdwarfs, and the open circles the young candidates. The black line gives the fits, and the gray lines include the asymptotic standard errors. The G − J vs. spectral type relation is valid from M7 to L9). The black dashed line is the relation derived from L0 to L7 found in Gaia DR1 (Smart et al. 2017).
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