Evolutionary tracks in the HRD for models computed with different efficiencies of overshooting and semiconvective mixing, from core hydrogen ignition to core helium exhaustion. Left panel: models computed with inefficient semiconvective mixing (α_sc = 0.01) for three different overshooting parameters (α_ov = 0.11, 0.33, and 0.55), while the right panels: models computed with efficient semiconvection (α_sc = 100), for the same three different values of the overshooting parameter. The time difference between two neighboring markers on a track is 50 000 yr. A circular marker means that the model is core hydrogen burning, a diamond indicates core helium burning. The models shown are nonrotating.