Figure 3.

Dimensionless mechanical time $\overline{t}=\left(\Delta G_{\text{ATP}}/\left({\gamma }_0+{\gamma }_{\text{L}}\right)\right)t_{\text{mech}}$, as a function of the parameter α. It shows a maximum for α_M ∼ 0.71 (dashed line), which corresponds to a substep angle of ∼85°.