HR diagram of the members of 25 Ori (upper panel; squares) and λ Ori (lower panel; triangles) where the abundance analysis was done. The Palla & Stahler (1999) PMS evolutionary tracks are displayed with the labels representing their masses (solid lines). Similarly, the birthline and isochrones (from 1 to 100 Myr) are shown with dash-dotted and dotted lines, respectively.
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