log T_eff − log g diagram for the stars analyzed spectroscopically by us with MUSE (black dots) and by other authors (magenta dots). The Z = 0.002 PARSEC isochrones of 18 and 30 Myr are also reported with red and blue solid lines, respectively. We also report the name of the stars. We show the log T_eff and log g of A4 determined by us (A4) and by Lennon et al. (2003; A4L).