\begin{table}%t2
\caption{\label{table xraydata}Two new X-ray observations of Cyg~OB2 No.~8A.}
%\centerline
{\small
\par
\begin{tabular}{ccclcccccccc}
\hline\hline
Phase & Rev.    & Obs. ID & Date & JD & \multicolumn{3}{c}{Exp. time} &  & \multicolumn{3}{c}{Count rates} \\
      &         &         &      &    & \multicolumn{3}{c}{(s)} &  & \multicolumn{3}{c}{(counts~s$^{-1}$)} \\
\cline{6-8}\cline{10-12}
 &    &  &  &  & MOS1 & MOS2 & pn & & MOS1 & MOS2 & pn \\
\hline
0.155 & 1353 & 0505110301 & 2007 Apr. 29 & 4220.417 & 26879 & 27149 & 20581 & & $0.655\pm 0.006$ & $0.640\pm 0.005$ & $1.892\pm0.012$ \\
0.326 & 1355 & 0505110401 & 2007 May 03 & 4224.167 & 27065 & 29155 & 22116 & & $0.734\pm 0.006$ & $0.730\pm 0.006$ & $2.114\pm0.011$ \\
\hline
\end{tabular}}
\tablefoot{These X-ray observations were performed in 2007 with
\emph{XMM-Newton}. The first five columns give respectively
the orbital phase, the revolution
number, the observation ID, the observation date, and the Julian date
($-$2~450~000) at mid-exposure. The other columns give respectively
the effective exposure time, and the count rates
for the three EPIC instruments.}\vspace*{-2mm}
\end{table}