\begin{table}%t2
\caption{\label{tab2}Targets: observation log and data.}
%\centerline
{
\begin{tabular}{lcccccc}
\hline\hline
\noalign{\smallskip}
Object Name  & Seq. Num.& Exposure & Start Date & Net Rate & Bkg Rate & $c/f$ \\
~~~~~~~(1) & (2)      &  (3)     &(4)         &   (5)    &    (6)   & (7) \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
PKS 0548--322 & 700145 & 4559  &1999/12/31  & $0.235 \pm 0.007$& 4.71 & 0.7516 \\
3C 371        & 700146 & 10~120 &2000/03/21  & $0.263 \pm 0.005$& 4.56 & 0.8334 \\
PKS 2005--489 & 700147 & 5858  &2000/10/07  & $0.491 \pm 0.009$& 2.61 & 1.5719 \\
BL Lac        & 700148 & 2117  &2000/01/07  & $0.171 \pm 0.009$& 0.14 & 0.5464 \\
              & 700196 & 1039  &2000/02/16  & $0.172 \pm 0.013$& 0.08 & --    \\
1ES 2321+419  & 700149 & 4628  &2000/02/08  & $0.253 \pm 0.007$& 0.84 & 0.8114 \\
1ES 2344+514  & 700150 & 2727  &2000/02/08  & $0.185 \pm 0.008$& 1.17 & 0.5912 \\
\hline
\end{tabular}}
\smallskip
{ Columns}: $\rm (1)=Source$ name; $\rm (2)=Sequence$ number of the observation; $\rm (3)=Net$ Chandra exposure in seconds after data screening;  $\rm (4)=Observation$ start date (Year-Month-Day); $\rm (5)=Net$ photon count rate~(c/s) of the source in the energy range 0.3--8~keV; $\rm (6)=Background$ photon count rate (in units of~$10^{-3}$~s$^{-1}$) obtained rescaling to the same extraction region used for the net source count rate; $\rm (7)=Count$/frame evaluated with PIMMs and using spectral information from the literature 
(see previous table for the references). The input flux in PIMMs is such that the output flux corresponds to the measured one. 
\end{table}