在letax 双栏中插入跨栏图标时，将\begin{table}写成\begin{table*}。但是会出现表格下面的页面出现空白的现象。这是将\begin{table*}[htpb]写成\begin{table*}[t]即可，此时表格出现在页面顶部。若改为\begin{table*}[b], 则表格出现在页面底部。其他形式则无效。

\begin{table*}[t]

 \caption{Comparison of this study with the previous resilient frequency control methods }

 \begin{center}

\renewcommand\arraystretch{1.3}

\begin{tabular*}{18cm} {@{\extracolsep{\fill}}ccccccccc}

  \toprule

   Paper &frequency control & DoS attack & Communication scheme & analysis method & Defense strategy \\

   \midrule

  Area 1 &0.166&0.015&3&0.08&0.4\\

    Area 2 &0.202&0.016&2.73&0.06&0.44\\

    Area 2 &0.202&0.016&2.73&0.06&0.44\\

    Area 2 &0.202&0.016&2.73&0.06&0.44\\

    Area 2 &0.202&0.016&2.73&0.06&0.44\\

  \botrule

 \end{tabular*}

 \end{center}

 \label{t-1}

\end{table*}