\caption{(a)} \end{minipage} \hspace{-0.2in} \begin{minipage}[b]{0.5 \textwidth} \includegraphics[width=\textwidth]{Fig.3(b).eps} \caption{(b)} \end{minipage} \hspace{-40.0pt} \par \vspace{-10.pt} \hspace{-36.0pt} \begin{minipage}[b]{0.5 \textwidth} \includegraphics[width...
\hspace{-40.0pt} \par \vspace{-10.pt} \hspace{-36.0pt} \begin{minipage}[b]{0.5 \textwidth} \includegraphics[width=\textwidth]{kongbai.eps} \caption{(c)} \end{minipage} \hspace{-0.2in} \begin{minipage}[b]{0.5 \textwidth} \includegraphics[width=\textwidth]{Fig.3(d).eps} \cap...
\hspace{-40.0pt} \par \vspace{-10.pt} \hspace{-36.0pt} \begin{minipage}[b]{0.5 \textwidth} \includegraphics[width=\textwidth]{kongbai.eps} \caption{(c)} \end{minipage} \hspace{-0.2in} \begin{minipage}[b]{0.5 \textwidth} \includegraphics[width=\textwidth]{Fig.3(d).eps} \cap...