\documentclass[12pt]{article}
\usepackage{graphicx}

\begin{document}

\begin{tabular}{c|c}
CCK 3-body
& LSODE 3-body\\ \hline
\includegraphics[width=0.45\textwidth]{3bodyTrajectoriesCCK.pdf}
& \includegraphics[width=0.45\textwidth]{3bodyTrajectoriesLSODE.pdf}\\
\includegraphics[width=0.45\textwidth]{3bodyEnergiesCCK.pdf}
& \includegraphics[width=0.45\textwidth]{3bodyEnergiesLSODE.pdf}\\
\includegraphics[width=0.45\textwidth]{3bodyEnergyCCK.pdf}
& \includegraphics[width=0.45\textwidth]{3bodyEnergyLSODE.pdf}\\
\includegraphics[width=0.45\textwidth]{3bodyMomentaCCK.pdf}
& \includegraphics[width=0.45\textwidth]{3bodyMomentaLSODE.pdf}\\
\end{tabular}

\begin{tabular}{c|c}
CCK 5-body
& LSODE 5-body\\ \hline
\includegraphics[width=0.45\textwidth]{5bodyTrajectoriesCCK.pdf}
& \includegraphics[width=0.45\textwidth]{5bodyTrajectoriesLSODE.pdf}\\
\includegraphics[width=0.45\textwidth]{5bodyEnergiesCCK.pdf}
& \includegraphics[width=0.45\textwidth]{5bodyEnergiesLSODE.pdf}\\
\includegraphics[width=0.45\textwidth]{5bodyEnergyCCK.pdf}
& \includegraphics[width=0.45\textwidth]{5bodyEnergyLSODE.pdf}\\
\includegraphics[width=0.45\textwidth]{5bodyMomentaCCK.pdf}
& \includegraphics[width=0.45\textwidth]{5bodyMomentaLSODE.pdf}\\
\end{tabular}


\end{document}