Top: HR diagram including evolutionary tracks for models with masses between 1.5 and 1.9 M_⊙ computed without atomic diffusion (black solid lines), and including atomic diffusion (with radiative accelerations) with a parametrised turbulent diffusion coefficient calibrated on Am stars (red dashed lines) and on three Kepler F-type stars (green dotted lines). Bottom: radius according to luminosity for the models shown on the top panel. The blue and orange symbols are the same as in Fig. 1.