Colour-period diagram for NGC 2516 encoded with the X-ray luminosities of the rotators in NGC 2516 (data from both Chandra and XMM-Newton). Green symbols indicate radial velocity and photometric binaries, while all other stars are in blue. Filled circles are detected members, while open circles denote upper limits from the Chandra observations. Black points show the locations of all stars without measured X-ray luminosities. The dotted lines trace (from top to bottom) Ro = {0.15, 0.1, 0.05, 0.025, 0.01, 0.005, 0.001}.