Latex 横排图片

egin{figure}
egin{minipage}[t]{0.5linewidth}
centering
includegraphics[width=2.2in]{figure/angled_k_space1}
caption{fig1}
label{a}
end{minipage}
egin{minipage}[t]{0.5linewidth}
centering
includegraphics[width=2.2in]{figure/angled_k_space2}
caption{fig2}
label{b}
end{minipage}
end{figure}



egin{figure}[htbp]
centering
subfloat[456]{
label{fig:improved_subfig_a}
egin{minipage}[t]{0.5linewidth}
centering
includegraphics[width=2.2in]{figure/angled_k_space1}
end{minipage}
}
subfloat[123]{
label{fig:improved_subfig_b}
egin{minipage}[t]{0.5linewidth}
centering
includegraphics[width=2.2in]{figure/angled_k_space1}
end{minipage}
}
caption{}
end{figure}