Evolution as a function of time of the total mass (red curve), of the mass fraction of ²⁶Al at the centre and at the surface of 120 M_⊙ at Z  =  0.014. Top panel: the case when the Vink’s formula for the mass-loss rate is adopted. Bottom panel: the case when the new rates obtained from hydrodynamic wind models are used. Note that making the plot more easily readable the curves for the mass fraction have been obtained by multiplying the mass fraction by a constant factor and the starting point of each curves has been shifted upwards along the Y axis (see the figure for the adopted values). Black dots represent the same as indicated in Fig. 6.