Hertzsprung-Russell diagram for the Lupus sample. The four subluminous objects described in the text are represented with open circles as labelled. The continuous lines show the 1 Myr, 3 Myr, 30 Myr, and 10 Gyr isochrones, reported by Baraffe et al. (1998), while the dashed lines show the low-mass PMS evolutionary tracks by the same authors as labelled.
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