Fig. 1

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Gaia color-magnitude diagram (MG vs G GRP) for the lists of UCDs defined in Sect. 2. In each panel, all three master tables are shown but one of them is high-lighted in red: left – known late-M dwarfs from J. Gagnés M6…M9 dwarf archive, middle – known MLTY dwarfs with Gaia-DR2 data from the GUCDS sample (Smart et al. 2019), right – new Gaia-discovered UCD candidates (Reylé 2018).

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