Abundance evolutions obtained with OP and OPAL opacity calculations for the three masses studied (1.5, 2, and 2.5 M_⊙, represented with black, red, and blue lines, respectively). The reference model used OP opacities along with OP g_rad (thick solid lines, ‘OP+OP’). The runs using OPAL opacities and OP or SVP2004 g_rad are shown with dashed (‘OPAL+OP’) or dotted (‘OPAL+SVP2004’) lines, respectively. The thin dotted line and the grey bar have the same meaning as in Figs. 5 to 7.