Fig. 1. Abundance profiles for some elements in the three models (The mass fractions are multiplied by 250 for ³ He, by 200 for ¹² C, by 100 for ¹³ C, by 140 for ¹⁴ N and by 75 for ¹⁶ O): graph a for model T1; graph b for model T2; graph c for model T3.