\documentclass{minimal}
% Load packages
\usepackage{graphicx}
\usepackage{color}
% Set papersize
\usepackage[papersize={17cm,13.5cm},text={18cm,14cm}]{geometry}
% No page numbers and no paragraph indentation
\pagestyle{empty}
\setlength{\parindent}{0bp}%
% Load configuration file
\InputIfFileExists{gnuplot.cfg}{%
  \typeout{Using configuration file gnuplot.cfg}%
}{%
 \typeout{No configuration file gnuplot.cfg found.}%
}%
%

\begin{document}

\vspace*{-0.5cm}
\begin{center}
\includegraphics[angle=-90,width=0.49\textwidth]{./LALInspiralBankHm1m2}
\includegraphics[angle=-90,width=0.49\textwidth]{./LALInspiralBankHtotalMassEta}\\
\includegraphics[angle=-90,width=0.49\textwidth]{./LALInspiralBankHt0t2}
\includegraphics[angle=-90,width=0.49\textwidth]{./LALInspiralBankHt0t3}
\end{center}

\end{document}

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