\begin{table}%t1
\caption{\label{xlog}Log of the XMM X-ray observations of HU Aqr.}
%\centerline
 {\begin{tabular}{llcc}
\noalign{\smallskip} \hline\hline \noalign{\smallskip}
      Date & Detector$^{1}$  & $T_{\rm Exp}$  
      & Mean rate$^{2}$  \\
     & &  (ks)        &    (cts/s)  \\
\noalign{\smallskip} \hline \noalign{\smallskip}
    2002 May 16--17 & PN-sw  & 36.4&  1.11   \\
                    & MOS1-sw  & 37.2 & 0.19       \\
                    & MOS2-sw  & 37.2 & 0.26      \\
    2003 May 19     & PN-ti  & 18.5 &  0.94   \\
                    & MOS1-ti  & 20.2   & 0.21    \\
                    & MOS2-ti  & 20.0   & 0.18     \\
    2003 Oct. 24--25 & PN-sw  & 11.4   & 0.011  \\
                    & MOS1-sw  & 11.6   &  --\\
                    & MOS2-sw  & 11.6   &  --\\
    2005 May 16     & PN-ti  & 18.6  & --\\
                    & MOS1-sw  & 19.4   & 0.0025     \\
                    & MOS2-sw  & 19.4   & 0.0022\\
 \noalign{\smallskip}
 \hline
 \noalign{\smallskip}
      \end{tabular}}
\par
      \smallskip
   \noindent {\Ni\small $^{1}$ The abbreviations after the PN/MOS detector 
   indicate the instrument mode: sw~=~small window, ti~=~timing. 
                       $^{2}$ In the bright phase interval $\phi =
                       0.62{-}0.91$ and $\phi = 0.05{-}0.18$. Energy range used 
                       0.18--10~keV and 0.3--10~keV for imaging and timing 
                       modes, respectively. Count rates have been corrected
                       for the~65\% encircled energy fraction corresponding 
                       to the aperture used.
            }
       \end{table}