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The ${\rm t\bar t}$ couplings to the photon and the Z can be parameterized in several ways. In Ref.~\cite{Baer_2013}, for example, the following $F_i$ parameterization is used:  \begin{equation}  \Gamma_\mu^{ttX} = -ie \left\{ \gamma_\mu \left( F_{1V}^X +\gamma_5 F_{1A}^X \right) + \fraction{\sigma_{\mu\nu}}{2 {\sigma_{\mu\nu} \over 2  m_{\rm t}} (p_t -p_{\bar t})_\mu \left( i F_{2V}^X + \gamma_5 F_{2A}^X \right)\right\} \end{equation}