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Fig. 1.


Colour-magnitude diagrams of the open clusters in our sample. The giants that were observed are shown as red filled squares (for cluster members) and red open squares (for the non-members). PARSEC isochrones (Bressan et al. 2012) with solar metallicity are shown in each panel. The red isochrones were computed with cluster data from Kharchenko et al. (2013); the blue isochrones were computed with data from other sources (see references in Table 2).

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