Fig. 5
Same as Fig. 4 but with theoretical isochrones for different cluster ages. The isochrones, shown with alternating line styles, were constructed by Lejeune & Schaerer (2001). The majority of the population of OB stars in the Quintuplet falls between the 2 and 4 Myr isochrones, while most KM stars would need more than 30 Myr to evolve
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