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\begin{figure}
\centering
\includegraphics[height=2in,width=3in]{nullcline_2.eps}
\includegraphics[height=2in,width=3in]{nullcline_1.eps}
\includegraphics[height=2in,width=3in]{nullcline_0.eps}
\includegraphics[height=2in,width=3in]{nullcline_asymptote.eps}
\caption{\scriptsize The same as before}
\label{fig:nullcline_1}
\end{figure}