Mass-luminosity relation fitted in this work (in blue). The areas outside the 6 < M_G < 13.5 range are shown by the dotted line. The grey area corresponds to the 1σ bootstrap interval. The stars from Table 3 (resolved Gaia stars with direct-imaging data) are plotted in blue, and stars from Tables 1 and 2 (SB2 data combined with Gaia NSS astrometric solution) are shown in grey. The dashed green lines show the solar metallicity PARSEC isochrones for main-sequence stars (isochrones with the label 1). The dot-dashed red line and the two-dash pink line are the solar metallicity isochrone of Baraffe et al. (2015) and BASTI, respectively; they only deviate at masses lower than ∼ 0.12 ℳ_⊙.