-\chapter*{Electron Gun Control Circuit}
+\chapter*{Appendix - Electron Gun Control Circuit}
The control circuit diagram for the electron gun is shown in Figure \ref{electron_gun.pdf}. The wiring of the circuit, including resistors and potentiometers, was incoroprated into a single box, with external connections available for the power supplies, ammeters, electron gun, and sample holder. Both the components and operation of this circuit are straightforward; we will give a brief overview here for completeness.
\end{itemize}
\begin{landscape}
\begin{center}
- \includegraphics[scale=0.80]{figures/electron_gun.pdf}
+ \includegraphics[scale=0.80]{figures/egun/electron_gun.pdf}
\captionof{figure}{Circuit Diagram for Electron Gun Control}
\label{electron_gun.pdf}
\end{center}