HR diagram showing evolutionary tracks for stellar models with different masses (1.2 ≤ M_⋆/M_⊙ ≤ 2.2), Z = 0.015 and without overshooting (f = 0) in black, and Z = 0.01 and f = 0.03 in light blue, from the ZAMS to the TAMS. The value of the stellar mass (M_⋆) is indicated for a subset of the tracks (those displayed with solid lines). Black, red, green, and blue dots correspond to the location of stellar models with M_⋆/M_⊙ = 1.3,1.7 and 2.1 having a central H abundance of , respectively. A sample of δ Sct (open circles), γ Dor (grey squares), and hybrid δ Sct-γ Dor (red star symbols) stars taken from Grigahcène et al. (2010) are included for illustrative purposes. Also, the boundaries of the δ Sct (violet dot-dashed lines) and γ Dor (green dashed lines) theoretical instability strips from Dupret et al. (2005) are plotted.