Top: semi-empirical values Qc of the convective core mass at the ZAMS (normalized to the total mass) for each of the stars in our sample. Triangles represent components of systems with age differences exceeding 5%. The dashed line is a third-order polynomial fit drawn to guide the eye. The solid line shows the trend of Qc with mass for solar-metallicity ZAMS models having αov = 0, for reference. Bottom: fractional increase in Qc over that indicated by the solid line in the top panel, expressed as a percentage.
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