Fig. 11
HR diagram for the stars in the X-Clump 0534+22. The pre-main sequence evolutionary tracks of Palla & Stahler (1999), together with their isochrones and birthline are shown by solid, dotted, and dash-dotted lines, respectively. Labels indicating the track masses and the isochronal ages (from 1 to 100 Myr) are also overlaid.
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