Production factors (ejected mass divided by the initial mass of the element) for the 25 M_⊙ models with Z = 10^-5. The model without rotation (triangles) does not produce s-process nuclei efficiently, whereas the rotating models (circles, B1, and diamonds, B3) do. The additional, rotating models with reduced ¹⁷O(α,γ) rates (stars, B4, CF88/10) highlight the uncertainty for the neutron poison ¹⁶O.