Absolute magnitude M_G against G_BP − G_RP colour for all the stars in our sample and their resolved companions with full photometry available in Gaia DR3. Red crosses correspond to components of multiple systems that are very close, very faint, or both, resulting in compromised photometry. Very bright stars (e.g. Capella or Castor) are necessarily excluded for lacking Gaia photometric measurements. Very compact systems, not resolved by Gaia (Sect. 3.2), and resolved young stars (Sect. 4.5) lie above the main sequence.