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The fourth is the accuracy of the estimator, quantified by the average relative residuals  \begin{equation}  A=\frac{1}{fN}|\sum_i A=\frac{1}{fN}\left|\sum_i  \left(\frac{\tilde{\Delta t}_i - \Delta t_i}{\Delta t}\right)| t}\right)\right|  \end{equation}  The initial function of these metrics is to define a minimal performance threshold that must be passed, in order to guarantee meaningful results in TDC1. To pass TDC0, an analysis team's results must satisfy the following criteria.