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The passage around this formula

A molecular clock or motor is useful not only when its average current is nonzero but when that current is sufficiently precise. Let $J_\tau$ be an integrated current observed for time $\tau$ , such as net molecular steps or transported ions. Define dimensionless mean entropy production $\langle$$\Sigma_\tau$$\rangle$=$\langle$$\Delta$ $s_{\mathrm{tot}}$$\rangle$/$k_{\mathrm B}$ . A canonical steady-state thermodynamic uncertainty relation has the form

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