Colour-activity diagram based on the combined set of all observations for stars in the NGC 2516 field. We show the fractional X-ray luminosity (log L_X/L_bol) against Gaia (G − G_RP)₀ colour for cluster members (orange) and cluster non-members (small, grey symbols). Cluster binaries are indicated with orange squares. Members with measured rotation periods are additionally marked with a small black dot, members with identified flares in their light curves with an x, and members with two potential optical counterparts with pluses. Overall, the lower mass stars have X-ray activity exceeding that of higher mass stars by orders of magnitude, reaching the saturation limit for M-type and many K-type stars. The dashed line indicates an estimate of the detection limit for cluster members.