A figure and a table often have multiple sub-figures and sub-tables. You might want to put a caption for each sub-figure/table.
You can use subfigure.sty to assign sub-captions to sub-figures/tables.
Example:...\usepackag{subfigure}
...
...
\begin{centre}
\begin{figure}
\begin{tabular}[t]{c}
\subfigure[The 1st figure]{\includegraphics{firstpic.eps}}
\subfigure[The 2nd figure]{\includegraphics{secondpic.eps}}\\
\subfigure[The 3rd figure]{\includegraphics{thirdpic.eps}}
\end{tabular}
\caption{Figures to explain subfigure.sty.\label{fig:subfigs} }
\end{figure}
\end{center}
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