The 25 Msun star seems to be somewhat responsible for the structures observed for 31P, 35Cl and 39K around R3alpha mutiplier of 1 and the 12C(a,g) multiplier of 1.2.

1. The reaction rate ratio is constant (i.e. R3alpa and R12C(a,g) are changed by the same amount):

2. Only R3alpha varies (i.e R12C(a,g) constant):

3. Only R12C(a,g) varies (i.e R3alpha constant):