Colour–magnitude diagram of the open cluster M 67. (V, B − V) photometry is taken from Montgomery et al. (1993) and a colour excess of E(B − V) = 0.05 has been assumed, as in Melo et al. (2001). Stars from our sample are shown as open dot circles. The track is an isochrone at 3.7 Gyr from Vandenberg (private communication) based on models with diffusion from Michaud et al. (2004).
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