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\begin{table}[!htbp]
\begin{center}
\caption{Parameters used in simulation.}
\vspace{0.2cm}
\begin{tabularx}{0.85\textwidth}{>{centering}p{12cm}X}
\toprule
$(\alpha, \beta) = (0.67, 0.67) (i.e., \theta = \pi/4 (45^\circ), r = 0.948)$\\
$(\alpha, \beta) = (0, 0.94) (i.e.,\theta = \pi/2 (90^\circ), r = 0.94)$\\
$(\alpha, \beta) = (-0.705, 0.646) (i.e.,\theta = 2.4 (137.5^\circ), r = 0.956)$\\
\bottomrule
\end{tabularx}
\label{SDAalpahbeta20140221}
\end{center}
\end{table}
在这个基础上使用multicolum宏包合并几个单元格即可
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