\def\GWslide{\begin{frame} \frametitle{Magnetic confinement - Tokamak}
  \begin{figure}[t]
    \centering
    \GWig{width=0.8\textwidth}{Theory/Fusion/FusionIntro/MagneticConfinementTokamak/figs/tokamak.png}
  \end{figure}
\end{frame}}