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\section{Optimal-observable statistical analysis}  \label{sec:optimal}  There are nine different functions entering Eq.~\ref{eq:optimal}, and eight form factors $\delta_i$ to be evaluated from a given sample of ${\rm t \bar t}$ events. In principle, all eight form factors and their uncertainties can be determined simultaneously. Experimentalists usually maximize numerically a global likelihood $L$ -- or equivalently, minimize the negative Log-likelihood $-\Log $-\log  L$ -- with respect to all form factors: \begin{equation}  L = {\mu^N \over N!}{\rm e}^{-\mu} \times \prod_{k=1}^N p(k),  \end{equation}