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\begin{equation}  \sigma(\delta_i) = \sqrt{ [ V^{-1} ]_{ii} } \ .  \end{equation}  This analytical procedure is used in Ref.~\cite{Grzadkowski_2000} to determine the sensitivity to top-quark electroweak couplings in $500\,{\rm fb}^{-1}$ of ${\rm e^+ e^-}$ collisions at $\sqrt{s} = 500$\,GeV.