\epubtkImage{}{%
\begin{figure}[h]
  \def\epsfsize#1#2{0.8#1}
  \centerline{\epsfbox{figure_01.eps}}
  \caption{\it Distribution of the quantities $ \phi $, $ u $ 
    and $ \gamma $ on the numerical grid.}
  \label{figure:numerical_grid}
\end{figure}}
.
