Kippenhahn diagrams for M_ZAMS = 70 M_⊙ (left) and M_ZAMS = 80 M_⊙ (right) with Z = 0.001. The Convective zones are indicated by purple hashed lines, and vertical purple lines indicate adjacent convective regions. Burning zones of H, He, and C are indicated by solid-shaded blue, green, and pink regions, respectively. The He core and CO core masses are represented by blue and green lines, respectively.