\begin{figure}
\centering
  \begin{subfigure}[b]{0.45\linewidth}
    \includegraphics[width=\linewidth]{plot_t_fini.eps}
    \caption{Picture 1}
    \label{fig:1}
  \end{subfigure}
  %
  \hfill
  \begin{subfigure}[b]{0.45\linewidth}
    \includegraphics[width=\linewidth]{plot_t_infini.eps}
    \caption{Picture 2}
    \label{fig:2}
  \end{subfigure}
\end{figure}