Fig. 1
Stellar evolution tracks computed using the Heger et al. (2000) stellar evolution program. The red solid line represents αc = 0.2, green dashed line αc = 0.3, blue small-dashed line αc = 0.4 and the magenta dotted line is αc = 0.45. The black triangles with error bars represent the observed radius and effective temperature of the binary components.
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