Details of the evolution of our 5 M_⊙ model of Z = ×10⁻⁸. Upper panel: temporal evolution of luminosities associated with H-burning (L_H, black), and He-burning luminosity (L_He, red). In the case of H-burning, the contributions due to the pp-chains (L_pp) and the CNO-cycle (L_CNO) are shown, respectively, in black dotted and dashed lines. Middle panel: evolution of convective regions (grey areas), and the location of the H-burning shell (HBS) and the He-burning shell (HeBS) in black and red lines respectively. Lower panel: evolution of surface abundances of ¹²C (green), ¹⁴N (blue), ¹⁶O (green), and Z_other (gold), which represents all the species of mass higher than ¹⁶O.