双列文档中的表格末尾没有出现水平线

Question

我正在尝试使用以下代码将表格插入到两列文档中，但在输出中最后一行之后没有水平线。

\begin{table*}[t]
\centering
\caption{Classification of river sediment}
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline
    Particle & Clay & Silt & Sand & Gravel & Cobbles & Boulders\\ \hline
    Size (mm) & $<0.002$ & $0.002-0.06$ & $0.06-2$ & $2-60$ & $60-250$ & $>250$ \hline
\end{tabular}
\label{tab:1}
\end{table*}

Answer 1

\begin{table*}[t]
    \centering
    \caption{Classification of river sediment}
    \begin{tabular}{|c|c|c|c|c|c|c|}
        \hline
        Particle & Clay & Silt & Sand & Gravel & Cobbles & Boulders\\ \hline
        Size (mm) & $<0.002$ & $0.002-0.06$ & $0.06-2$ & $2-60$ & $60-250$ & $>250$ 
        \\\hline%<------------------------new
    \end{tabular}
    \label{tab:1}
\end{table*}