Sub Articulo 140.4
> \begin{center}
> \begin{figure}
> \includegraphicx[....]{abc.eps}
> \caption{..}
> \label{..}
> \end{figure}
> \begin{figure}
> \includegraphicx[....]{def.eps}
> \caption{..}
> \label{..}
> \end{figure}
> \end{center}
Anyway, this is probably not what you want. It puts two floating
objects inside a center env. The floatings float away, and you're left
with nothing inside "center". Use
\begin{figure}
\begin{center}
... whatever ...
\caption{One}\label{one}
... whatever ...
\caption{Two}\label{two}
\end{center}
\end{figure}
to keep your two graphics together in one floating figure, each
graphics having it's own caption.