\begin{table}%t2
%\centering
\par
\caption{Observations. 1. identification of the ULXs. 2. telescope and instrument used.  3. epoch of observations. 4.
exposure time.\label{tab2}}
\begin{tabular}{lllc}
\hline\hline
 Main ID &  Telescope &  Date  &  Exposure time   
  \\
&  & &  (s)  \\
\hline
IXO~29  & 4.2 m WHT ISIS    & October 2006  & $3\times 1800$       \\
IXO~43  & 1.9 m OHP CARELEC & March 2005    & $2\times 1800$       \\
IXO~54  & 1.9 m OHP CARELEC & March 2005    & $3\times 1800$       \\
IXO~55  & 4.2 m WHT ISIS    & November 2006 & $2\times 600+1\times 500$  \\
IXO~56  & 4.2 m WHT ISIS    & November 2006 & $3\times 600$	   \\
IXO~57  & 1.9 m OHP CARELEC & March 2005    & $1\times 1800$ 	   \\
IXO~70  & 4.2 m WHT ISIS    & November 2006 & $1\times 400$ 	   \\
SW78    & 4.2 m WHT ISIS    & November 2006 & $2\times 600$ 	   \\
\hline
\end{tabular}
\end{table}