Fig. 2
Position of cold and hybrid models in a HRD at given ages. The black dashed lines provide isochrones for stellar ages of 1 Myr, 3 Myr, 5 Myr, 10 Myr and 50 Myr (from top to bottom) derived from non-accreting stellar evolution models of Baraffe et al. (1998). The cross symbols are observations from Bayo et al. (2011, 2012) in λ Orionis (~5 Myr).
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