Top: mass Q of the convective core as a function of the overshooting parameter ﹩{f}_{\mathrm{ov}}﹩, normalized to the mass Q₀ of the core without overshooting. Curves are labeled with the mass in solar units, and the vertical dotted line marks the representative value of ﹩{f}_{\mathrm{ov}}=0.014﹩ suggested by CB2018. Calculations are based on ZAMS models from MESA with Z = 0.0189 and ﹩{\alpha }_{\mathrm{MLT}}=1.80﹩. Bottom: same as the top panel, for the radius R of the convective core normalized to the size R₀ of the core with no overshooting. The horizontal dashed line follows from the Roxburgh criterion for small cores.