\begin{table}%t7
\caption{\label{tab7}XMM observations compared with IUE fluxes and ground based photometry.}
%\centering
\small
\begin{tabular}{ccccc}
\hline \hline
Filter  &  $\lambda_{\rm eff}$  & Observed flux  &  IUE flux& mag.\\
         &    (\AA)  &     (1 $\times$ 10$^{-14}$)   &     (1 $\times$
10$^{-14}$)&
\\
\hline
 {\it UVM2}  &    2310   &      0.92     & 0.80   &--  \\            
 {\it UVW1}  &    2910  &       0.86    & 0.92 &-- \\          
 {\it U}    &     3440  &       0.70    & -- &14.37 \\            
 {\it B}     &    4500  &       0.38    &-- &15.59  \\            
 {\it V}    &     5430  &       0.24   &-- &15.49   \\            
\hline
\end{tabular}
\end{table}