¹S and ¹D partial photoionization cross-sections of 3d¹⁰4s4p  ¹P° for Zn I. Solid and dashed lines represent the length and velocity forms of cross-sections, and the dotted lines represent the theoretical results carried out by Froese Fischer & Zatsarinny (2007). The inset in a) is the cross-section near the resonance of 3d¹⁰4p^2  1S on a logarithmic scale.