M G vs. G − J diagram of the filtered Gaia DR2 catalog (gray dots) at the low-mass end, superimposed on the known spectroscopic sample. Left panel: color-code gives the spectral type (10 stands for L0 and 20 for T0) and allows defining three regions, separated by the solid lines, from top to bottom: ≲M7, ~M7 to L0, and ≳L0. Right panel: squares represent the known subdwarfs, and open circles show the young candidates. The dashed lines aim to separate these different types.
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