Hertzprung-Russell diagram for 1.2 M_⊙ (left panel) and 1.5 M_⊙ (right panel) models. Computations with the Ledoux criterion and no mixing in the semiconvective regions are plotted with dashed blue lines, Schwarzschild criterion with solid red lines, and dotted black lines correspond to tracks with Schwarzschild criterion and overshooting. Two values for the semiconvective efficiency α_sc are also plotted in thin green dash-dotted line (α_sc = 0.001; not shown for the 1.2 M_⊙ as it overlaps with the dashed track) and thick light blue dash-dotted line (α_sc = 0.01). The tracks span the evolution from the Zero-Age main sequence until hydrogen exhaustion in the core.