Left Panel: Evolutionary tracks for masses M = 1.75, 1.80 M_⊙ with initial chemical composition (X, Z) = (0.73, 0.01). The adopted parameters of diffusive overshooting at the convective core boundary, f_ov, are colour-coded as indicated in the upper-left corner. The position of HR 7495 is marked by a filled square with error bars. Right panel: Convective core mass versus central hydrogen abundance X, with f_ov color-coded.