\begin{table}%t1
  \caption{\label{obs}X-ray observations used in this work.}
%\centering
\par
\begin{tabular}{lcccc} \hline\hline\noalign{\smallskip}
  Satellite & ID & $T_{\rm exp}$ (ks) & Obs. date \\ \hline
\xmm  & 0406730101 & 41\tablefootmark{a} &  26.09.2006\\
\suz  & 502077010 & 84 & 30.10.2007 \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{PN exposure time after proton flare screening.}}
\end{table}