\begin{figure}
\begin{minipage}[t]{0.5\linewidth}
\centering
\includegraphics[angle=270, scale=0.29]{sofsem-bitqueue2.ps}
\caption{Running times for \emph{MSMBP} and \emph{P3} with different pattern sizes.}
\label{F1}
\end{minipage} 
\hspace{1cm}
\begin{minipage}[t]{0.5\linewidth}
\centering
\includegraphics[angle=270, scale=0.29]{sofsem-bitfft2.ps}
\caption{Running times for \emph{MSMBP} and \emph{MSMFT} with different pattern sizes.}
\label{F2}
\end{minipage}
\end{figure}