HR diagram for IC 348 compared to evolutionary tracks of Baraffe et al. (1998) and Chabrier et al. (2000). Isochrones are shown for 1, 2, 5, 10, 30, 100, 1000 Myr. The tracks are labeled in units of solar mass. X-ray detections are represented by filled circles and non-detections as crosses. IC 348 members outside the Chandra fields are shown as open squares. The objects are color − coded according to their YSO class (see definition in Sect. 2.2).