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\subsection{Measuments \subsection{Measurements  with MegaTop} The precise measurement of the cross section at the $\ttbar$ production threshold is sensitive to the top quark pole mass, $m_{\rm top}$, the total decay width of the top quark, $\Gamma_{\rm top}$, and the Yukawa coupling of the top quark to the Higgs boson, $\lambda_{\rm top}$. The production cross section at threshold~\cite{g_Manohar_Stewart_Teubner_2001}, corrected for QCD effects at the next-to-next-to-leading order, is displayed in Fig.~\ref{fig:ttbar}, with and without the effects of initial state radiation (present at all $\epem$ colliders) and of beamstrahlung (only affecting linear colliders). The corresponding numbers of events expected at TLEP and at ILC are given in Table~\ref{tab:TopCross}.