Mass-radius (M–R) diagram showing the comparison of the parameters of D2–EB with evolutionary tracks and isochrones for single stars (Ekström et al. 2012) at Z = 0.014 with rotation. The symbols denoting each method are the same as in Fig. 8. Isochrones from the bottom up, correspond to 3.2, 4, 5, and 6.3 Myr. We find that both methods based on a He ii fit for measuring velocities yield co-evolutionary components of age 4.5 Myr. The best-fit model based on the CNO/ He i blend fit yields an age of ~5 Myr, as modeled with the WD code and with ELC.