Fig. 3.

Error probability $ϵ$ as a function of $\mathrm{\Delta }{G}_{\mathrm{p}\mathrm{o}\mathrm{l}}$ for all three mechanisms: (A) over a wide range of $\mathrm{\Delta }{G}_{\mathrm{p}\mathrm{o}\mathrm{l}}$ and (B) within the entropy-driven region $\mathrm{\Delta }{G}_{\mathrm{p}\mathrm{o}\mathrm{l}}\le 0$. The TT mechanism is always the least accurate, and the combined mechanism is the most accurate. All mechanisms have no accuracy in the limit of $ϵ\to 0$, and are far from the fundamental bound on single-site accuracy imposed by $H_{\mathrm{s}\mathrm{s}}=-ϵ\ln ϵ-\left(1-ϵ\right)\ln \left(1-ϵ\right)\ge -\mathrm{\Delta }{G}_{\mathrm{p}\mathrm{o}\mathrm{l}}$, except at $\mathrm{\Delta }{G}_{\mathrm{p}\mathrm{o}\mathrm{l}}\approx 0$.