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\section{Sensitivity to the top-quark electroweak couplings}  \label{sec:sensitivities}  The covariance matrices given in Section~\ref{sec:optimal} above  assume a perfect event reconstruction, an event selection efficiency of 100\%, a $4\pi$ detector acceptance, and the absence of background processes. While these hypotheses would not be utterly unrealistic at an ${\rm e^+ e^-}$ collider, a more conservative approach is in order to render the present estimates credible and reliable. {\bf Event reconstruction}