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The third metric is the precision of the estimator, quantified by the average relative uncertainties  \begin{equation}  P=\frac{1}{fN}\sum_i \left(\frac{\delta\tilde{\Delta_t}{\Delta \left(\frac{\delta\tilde{\Delta_t}}{\Delta  t}\right) \end{equation}  The fourth is the accuracy of the estimator, quantified by the average relative residuals