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HR diagram with the location of the low-mass young (red squares) and old (blue dots) PMS candidates. The theoretical isochrones (Bressan et al. 2012) are calculated for ages of 2, 4, 8, 16, 32, and 64 Myr (lines from right to left, respectively) and Z = 0.007. The small black dots are the targets of the sample of our catalog.
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