Evolution as a function of the stellar age in million years of the total mass (M_tot, continuous red curve), of the convective core mass (M_cc, continuous blue curve) in solar mass units, of the central (, dashed purple line), and surface ²⁶Al abundance (, dash-dotted purple line) in mass fractions for a non-rotating and a rotating stellar model at a metallicity Z = 0.014. The initial rotation of the rotating models is 40% of the critical velocity at the ZAMS. For clarity, the curves showing the ²⁶Al mass fraction are multiplied by factors equal to 7.0 × 10⁵ and 10⁶ for the central and surface values, respectively. The curve for the surface value is shifted so that its starting point at an age equal to 0 is 60 and 250 in the left and right panels, respectively. The time-averaged convective core mass fraction during the MS phase is indicated. The vertical light blue line indicates the end of the core H-burning phase and the beginning of the core He-burning phase.