%&pdflatex
\documentclass[12pt,a4paper]{article}
\usepackage{graphicx}

\begin{document}

\begin{figure}
	\centering
	\includegraphics[width=\textwidth]{Heater}
	\caption{Heater with initialisation}
\end{figure}


\begin{figure}
	\centering
	\includegraphics[width=\textwidth]{Water}
	\caption{Water }
\end{figure}

\begin{figure}\centering
	\includegraphics[width=0.5\textwidth]{Template-crop}\\[1in]
	\includegraphics[width=0.5\textwidth]{template-crop}

	\caption{With and without urgent channel}
\end{figure}

\begin{figure}\centering
	\includegraphics[width=0.75\textwidth]{urgent-crop}\\
	\includegraphics[width=0.75\textwidth]{non-urgent-crop}
	\caption{Traces of G and G==1}
\end{figure}

\end{document}

