Figure 14.

The forms of $g(\overline{s},a)$ and the flux rope twist ${\Phi }_1(\overline{s},a)$ after one zippette as functions of $\overline{s}$ for: (a) $0<a<1$ (i.e., $0<\overline{L}<3\sqrt{2}$; (b) $1<a<4$ (i.e., $3\sqrt{2}<\overline{L}<6\sqrt{2}$); and (c) $a>4$ (i.e., $\overline{L}>6\sqrt{2}$), where ${\overline{L}}^2=18a$, $\overline{s}=s/w_z$ is the ratio of the arcade shear to its width in Figure 6, and $\overline{L}=L/w_z$ is the ratio of the arcade length to its width.