\documentclass{article}
\usepackage[utf8x]{inputenc}
\usepackage[margin=1cm]{geometry}
\usepackage{graphicx}

\begin{document}
\section{OE vs MPE}
\subsection{Rapid technology change, winnertakes it all}
\begin{center}
\begin{tabular}{cc}
\includegraphics[width=0.45\textwidth]{graph0.png} &
\includegraphics[width=0.45\textwidth]{graph1.png} \\
\includegraphics[width=0.45\textwidth]{graph2.png} &
\includegraphics[width=0.45\textwidth]{graph3.png}
\end{tabular}
\end{center}

\includegraphics[width=0.45\textwidth]{mpe8.png} 

\input{stats.tex}

\end{document}
