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{\bf Other experimental uncertainties}  A number of other experimental uncertainties are listed in Ref.~\cite{Amjad_2013}, such as those affecting the measurement of the beam polarization (which enters crucially the cross section measurement); the effects of beamstrahlung; or the unambiguous top-quark reconstruction (which enters crucially the forward-backward asymmetry measurement). These uncertainties apply neither to the FCC-ee, where beamstrahlung effects are negligible and no beam polarization needs to be measured, nor to the present study, as the top-quark direction does not be to be reconstructed. The experimental uncertainties affecting the lepton energy and angular distributions can be safely neglected, given thevery  conservative assumptions on the resolutions and the smooth distributions. resolutions.  The total event rate, needed for the present study, requiresan accurate cross section prediction and  a precise luminosity determination. The precision of the integrated luminosity determination, a  measurement that  can be controlled to a fraction of a per mil, henceis  neglected here. {\bf Theoretical uncertainties}  The dominant systematic  uncertainty on is of theoretical nature. The total event rate indeed requires an accurate prediction of  the total cross section prediction, on the other hand, for top pair production. This prediction  is inferred to be  at the level of a few  per-mil level~\cite{Amjad_2013}, and is therefore the dominant systematic uncertainty. in Ref.~\cite{Amjad_2013}.  {\bf Integrated luminosity profile}