\begin{table}%[t!]%t1
%\centering
\par
\caption{{\it XMM-Newton} observations of WX Pyx.}
\label{obslist}
\begin{tabular}{r r l r r r l}
\hline \hline
     &       &      & Original & Filtered & Source & Detectors \\
 No. & Obsid & Date & expT & expT & count rate & used \\ \hline
  1 & 0149160101 & 2003 Apr. 23 & 45255 & 9478 & 0.04 & PN only \\
  2 & 0149160201 & 2003 May 20 & 29919 & 25~189 & 0.24 & PN \\ 
    &  $\cdots$  & $\cdots$   & $\cdots$ & 27~250 & 0.07 & MOS-1 \\
    &  $\cdots$  & $\cdots$   & $\cdots$ & 27~299 & 0.05 & MOS-2 \\ \hline
\end{tabular}
\end{table}