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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) + {\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} with, in the standard model, $F_{1V)^{\gamma} = -2/3$, $F_{1A)^{\gamma} = 0$, $F_{1V)^Z = (1-8\sin^2\theta_W/3)/4 \sin\theta_W\cos\theta_W$, $F_{1A)^Z = 1/4\sin\theta_W\cos\theta_W$, and vanishing $F_2$s.