Colour-period diagrams in (B − V)₀ colour, equivalent to those with Gaia colour in Fig. 16, comparing NGC 2516 (black in all panels) with the four open clusters M 35, Pleiades, M 50, and Blanco 1. The (B − V)₀ colours were obtained by transformation from Gaia (G_BP − G_RP)₀ photometry (Gruner & Barnes, in prep.) except for NGC 2516, where the observed B − V values were used when available.