\def\GWslide{
\begin{frame} \frametitle{The 1GW (approx. Prague) annual power requirement}
  \begin{figure}[t]
    \centering
    \GWig{width=\textwidth}{Theory/Fusion/FusionIntro/PragueEnergyDemands/figs/annualreq.png}
  \end{figure}
\end{frame}}

\def\GWslideCz{
\begin{frame} \frametitle{1GW (přibližně Praha) roční potřeba/spotřeba}
  \begin{figure}[t]
    \centering
    \GWig{width=\textwidth}{Theory/Fusion/FusionIntro/PragueEnergyDemands/figs/annualreq.png}
  \end{figure}
\end{frame}}