\begin{table}%t1
\caption{\label{t1}{\it XMM-Newton} and {\it Chandra} observations of Saturn.}        
%\centering
\par
\begin{tabular}{c c c c c c l }   
\hline\hline  
   \noalign{\smallskip}
 & Observation & Observation & Apparent & Heliocentric & Geocentric & 
  \\ 
Satellite & mid-epoch & duration & diameter & distance & distance & References
  \\
 &  &  (ks)  &  &  (AU)  &  (AU) &  \\
\hline                  
 {\it XMM-Newton} (1) & 2002 Oct. 01, 14:00 UT & 21 & $18.8''$ & 9.0 & 8.8 & 
Ness et~al. (\cite{Ness_x}), this paper \\  
 {\it Chandra} (1) & 2003 Apr. 14, 18:00 UT & 66 & $17.5''$ & 9.0 & 9.5 & 
Ness et~al. (\cite{Ness_c}) \\
 {\it Chandra} (2) & 2004 Jan. 20, 05:30 UT & 37 & $20.5''$ & 9.0 & 8.1 & 
Bhardwaj et~al. (\cite{Bhardwaj_05a},b), \\
  &  &    &  &    &   &  this paper \\
 {\it Chandra} (3) & 2004 Jan. 26, 20:00 UT & 36 & $20.4''$ & 9.0 & 8.2 & 
Bhardwaj et~al. (\cite{Bhardwaj_05a},b) \\ 
 {\it XMM-Newton} (2) & 2005 Apr. 22, 10:00 UT & 84 & $18.1''$ & 9.1 & 
9.2 & This paper  \\
 {\it XMM-Newton} (3) & 2005 Oct. 28, 21:00 UT & 74 & $18.2''$ & 9.1 & 
9.1 & This paper  \\
\hline              
\end{tabular}
\vspace*{2mm}
\end{table}