Isotopic production factors for the indicated nuclei. The isotopes of a given element are connected by solid lines. The filled circles indicate the most abundant isotope for each element, while the open circles denote the other isotopes. Our 150 M_⊙ (upper panel) and 250 M_⊙ (lower panel) PISN models (red thick) are compared with those of the similar 70 M_⊙ (upper panel) and 115 M_⊙ (lower panel) Population III helium star model by Heger & Woosley (2002) (blue thin lines).