(i, r − i) color–magnitude diagram of M stars (red dots), X-ray sources (blue crosses), and CTTSs (dark-red points) which are also selected using Gaia proper motions and parallaxes. Background grayscale image: same CMD as in Fig. 5a. Evolutionary tracks, isochrones and reddening vector as in the same figure. The red dashed line (roughly corresponding to a 25 Myr isochrone) delimits the CMD region occupied by X-ray and M-type members.