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Fig. 2.


Photometric selection of young stars. The reference stars are the members of the young clusters Trumpler 10, NGC 2451B, NGC 2547, Collinder 135, Collinder 140, and the Gamma Velorum cluster (Pozzo 1). The dashed line corresponds to the zero-age main sequence for a PARSEC isochrone of metallicity Z = 0.019 and AV = 0.15.

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