Evolutionary tracks of two models having the same initial conditions (Eq. (7)) accreting at the same rate (10^-4M_⊙ yr^-1), but computed with the two different versions of the code. The black dotted straight lines are iso-radius for the indicated values of R, and the black short-dashed line is the ZAMS of Ekström et al. (2012) with a few masses indicated. From bottom to top, the filled squares on each track are the apparition of the radiative core, the end of the convective envelope, and the apparition of the convective core (see Fig. 2).