Fig. 3
H-R diagram for OPAL (blue lines) and K-OPAL (black lines) models of M = 70,60,50,40,35,30, and 20 M⊙ calculated with the initial chemical composition X = 0.7347 and Z = 0.0169. No mass loss and no core overshooting were included in the calculations. Lo means the solar luminosity and Mo solar mass. (A color version of the figure is available online.)
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