Figure - Subfigure

gistfile1.txt

\begin{figure}[h]
\makebox[\linewidth][c]{%
  \begin{subfigure}[b]{.6\textwidth}
    \centering
    Figure 1
    \caption{5 feasible network states}
  \end{subfigure}%
  \begin{subfigure}[b]{.6\textwidth}
    \centering
    Figure 2
    \caption{10 feasible network states}
  \end{subfigure}%
}
\caption{Main figure}
\label{fig:main}
\end{figure}