\begin{table}%t1
%\centering
\par
\caption {\label{tab1}INTEGRAL/IBIS observations of the field around 4U 2206+54
from 2005 Dec. to 2006 Jan.  }
\begin{tabular}{l c c c l}
\hline \hline
\noalign{\smallskip}
 Rev. Num. & Date  & On-source time (ks) & Mean count rate s$^{-1}$ & Detection level \\
\hline
384 & 2005 Dec. 05--07 & 118  &  $2.86\pm 0.24$ & 15$\sigma$ \\
385 & 2005 Dec. 08--10 & 132 & $2.01\pm 0.20$ & 11$\sigma$\\
386 & 2005 Dec. 11--13 & 121 & $1.66\pm 0.19$ & 10$\sigma$ \\
387 & 2005 Dec. 14--16 & 98 & $11.9\pm 0.25$ & 45$\sigma$ \\
388 & 2005 Dec. 17--19 & 103 & $2.38\pm 0.21$ & 14$\sigma$ \\
389 & 2005 Dec. 20--22 & 110 & $1.38\pm 0.30$ & 6$\sigma$ \\
390 & 2005 Dec. 23--25 & 102 & $0.66\pm 0.25$ & 4.9$\sigma$ \\
391 & 2005 Dec. 26--28 & 113 & $1.78\pm 0.21$ & 9$\sigma$ \\
392 & 2005 Dec. 29--31 & 110 & $2.58\pm 0.22$ & $14\sigma$ \\
393 & 2006 Jan. 01--03 & 118 & $0.77\pm 0.21$ & $5.5\sigma$\\
394 & 2006 Jan. 04--06 & 115 & $1.68\pm 0.20$ & 10$\sigma$\\
395  & 2006 Jan. 07--09 & 124 & $1.61\pm 0.21$ & 9$\sigma$\\
\hline
\end{tabular}
\end{table}