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Fig. 1.
Spectral type distribution of the known ultra-cool (≥M7) and brown dwarfs. Black line: input catalog. Gray line: objects with a counterpart in Gaia DR2. Filled gray: objects with a counterpart in Gaia DR2 and σ ϖ ≤ 10%. 10 stands for L0, 20 for T0, and 30 for Y0 on the spectral type axis.
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