Colour–magnitude diagrams for likely members of NGC 2345 in three different photometric systems: Left: M_V/(b − y)₀ from the Strömgren photometry taken in this work; Center: M_KS/(J − K_S)₀ (2MASS photometry) and Right: G/(G_BP − G_RP) (Gaia DR2 data). Photometric data for likely members appear as grey dots. Stars observed spectroscopically are represented as red circles (RSGs), cyan circles (A supergiants), blue circles (blue stars), and magenta diamonds (Be stars). The black line shows the best-fitting PARSEC isochrone (log τ = 7.75).