I can't currently see a good way to modify the dimensions of the figure. The equivalent latex code would be:

\begin{center}
    \includegraphics[width=200px]{./plots/pandocplot9558264899394455289.png}
\end{center}

Is it possible to proxy parameters like this to the underlying images? I'm having an issue where the figure is overflowing the boundaries of the slide similar to the following:

This is more than just image overflow though, the caption "Figure 1: XYZ" is also being pushed off the page. Is there currently a way to rectify this?