Connections between colour, activity, and rotation in the traditional interpretation, wherein stars are classified into two categories, saturated and unsaturated. (Only cluster members with both rotation periods and X-ray detections are plotted in a 3-way layout, allowing individual stars to be cross-identified across panels.) Panel (a) (top left) shows the colour-activity diagram. As in Fig. 7, members with identified flares in their light curves are marked with blue x-shaped symbols, and members with two potential optical counterparts with blue pluses. Panel (b) (bottom left): the corresponding colour-period diagram, indicating dividing lines of equal Rossby number separating saturated and unsaturated stars. Lines for Ro/Ro_⊙ = 0.055 are displayed for the Barnes & Kim (2010) (dashed line) and Cranmer & Saar (2011) (dotted line) prescriptions. The four stars marked unsaturated below the separating line are the result of using a different colour to transform to the convective turnover timescale (see text). Panel (c) (top right): the corresponding rotation-activity diagram for the cluster members with measured rotation periods. The vertical line separating saturated and unsaturated stars corresponds to the line Ro/Ro_⊙ = 0.055 in the CPD.