\begin{table}%t2
\caption{Observation log.}
\par
%\centerline
{\small
%\scriptsize
\begin{tabular}{lccc}
\hline
\hline
\noalign{\smallskip}
Source          &  Date  &  MOS exposure  &   MOS rate$^a$       \\    
\noalign{\smallskip}
                    & [dd/mm/yyyy] &   [ks]             & [${\rm s^{-1}}$]  \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
\noalign{\smallskip}
  NGC~1692     & 15/08/2005   & 13.8             & $(6.7\pm0.2)\times 10^{-2}$         \\
\noalign{\smallskip}
\noalign{\smallskip}
   PKS~0625-35 & 03/05/2005   &  1.5               & $(7.4\pm0.2)\times 10^{-1}$       \\ 
               & 27/08/2005   & 13.1               & $(8.1\pm0.1)\times 10^{-1}$             \\
\noalign{\smallskip}
\noalign{\smallskip}
 3C~88       & 02/09/2006   & 22.4               & $(3.4\pm0.2)\times 10^{-2}$             \\   
\noalign{\smallskip}
\noalign{\smallskip}
 3C~444       & 02/11/2005   & 18.1               & $(1.2\pm0.1)\times 10^{-1}$            \\   
\hline
\end{tabular}}\medskip
 $^a$ The MOS1 count rate is consistent
with the MOS2 value within the quoted errors, whereas the pn count rate is $\sim$2.5 times the
MOS count rate. 
\label{tab2}
\end{table}