\begin{figure} \begin{minipage}[t]{0.5\linewidth} \centering \includegraphics[width=2.2in]{figure/angled_k_space1} \caption{fig1} \label{a} \end{minipage} \begin{minipage}[t]{0.5\linewidth} \centering \includegraphics[width=2.2in]{figure/angled_k_space2} \caption{fig2} \label{b} \end{minipage} \end{figure} \begin{figure}[htbp] \centering \subfloat[456]{ \label{fig:improved_subfig_a} \begin{minipage}[t]{0.5\linewidth} \centering \includegraphics[width=2.2in]{figure/angled_k_space1} \end{minipage} } \subfloat[123]{ \label{fig:improved_subfig_b} \begin{minipage}[t]{0.5\linewidth} \centering \includegraphics[width=2.2in]{figure/angled_k_space1} \end{minipage} } \caption{} \end{figure}
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