V/(b − y) diagram for all members in the cluster. Open squares represent the members catalogued as Be stars. The solid line is the isochrone of Marigo et al. (2008) corresponding to log t = 7.18, reddened by AV = 5.2 and displaced to DM = 13.0. The isochrone has been reddened taking into account colour effects, following the procedure described in Girardi et al. (2008).
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