Fig. 1
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Gaia DR2 colour-magnitude diagrams of the observed clusters, taking member stars from Cantat-Gaudin et al. (2020) (grey points). Blue crosses are spectroscopic targets sampled here. PARSEC isochrones (Marigo et al. 2017) at the metallicity computed in this paper were overplotted using distances, ages, and extinctions provided by Cantat-Gaudin et al. (2020). The clusters are ordered by increasing age. Ages are labelled in each panel.
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