Abundance of ¹⁴N as a function of the Lagrangian mass coordinate during different stages of the core He-burning phase for the 20 M_⊙ model with different initial rotations: zero (dotted curves), moderate (dashed curves), and fast (solid curves). The blue curves (left) correspond to the beginning of the core He-burning phase (Y_c = 0.9), the green curves (middle) to the halfway point (Y_c = 0.5), and the red curves (right) to the end of it (Y_c = 0). The non-rotating and moderately rotating models were taken from Murphy et al. (2021a).