\begin{table}%Tb1
\caption{\label{TSCR}Screening for low background level, source position and background extraction area. }
\small%\centering
\par
\begin{tabular}{llrr}
\hline\hline\noalign{\smallskip}
\multicolumn{1}{l}{$N$.\tablefootmark{1}} & \multicolumn{1}{l}{EPIC\tablefootmark{2}}  & \multicolumn{2}{c}{Net Source} \\
 &  & Count rate\tablefootmark{3}  & Exposure time\tablefootmark{4}  \\  
 &  & [$\rm 10^{-2}~s^{-1}$] & [$\rm ks$] \\  
  \hline  \noalign{\smallskip}
\multicolumn{4}{c}{Observation from 14.5.2003 / OI\tablefootmark{5}: 0150610201} \\ \noalign{\smallskip}
1 & pn & 13.12~$\pm$~0.44 &   7.1 \\ 
2 & M1 &  3.92~$\pm$~0.21 &  8.9  \\
3 & M2 &  4.12~$\pm$~0.22 &  9.2  \\ \noalign{\smallskip}
\multicolumn{4}{c}{Observation from 20.11.2005 / OI\tablefootmark{5}: 0300310201} \\ \noalign{\smallskip}
1 & M1 &  0.39~$\pm$~0.03 &  72.4 \\
2 & M2 &  0.37~$\pm$~0.03 &  73.7 \\
3 & pn &  1.26~$\pm$~0.06 &  63.7 \\ \noalign{\smallskip}
\multicolumn{4}{c}{Observation from 03.05.2007 / OI\tablefootmark{5}: 0500500601} \\ \noalign{\smallskip}
1 & M1 &  0.65~$\pm$~0.06 &  22.9 \\
2 & M2 &  0.54~$\pm$~0.06 &  23.7 \\
3 & pn &  1.90~$\pm$~0.13 &  13.8 \\  \noalign{\smallskip}
\multicolumn{4}{c}{Observation from 19.05.2007 / OI\tablefootmark{5}: 0500500701} \\ \noalign{\smallskip}
1 & M1 &  0.55~$\pm$~0.04 &  54.8 \\
2 & M2 &  0.54~$\pm$~0.03 &  57.8 \\
3 & pn &  1.91~$\pm$~0.08 &  40.4 \\ \noalign{\smallskip}
\multicolumn{4}{c}{Observation from 21.05.2007 / OI\tablefootmark{5}: 0500500801} \\ \noalign{\smallskip}
1 & M1 &  0.68~$\pm$~0.03 &  79.4 \\
2 & M2 &  0.54~$\pm$~0.03 &  89.5 \\
3 & pn &  2.08~$\pm$~0.07 &  62.8 \\ \noalign{\smallskip}
\multicolumn{4}{c}{Observation from 05.11.2007 / OI\tablefootmark{5}: 0500500901} \\ \noalign{\smallskip}
1 & M1 &  0.43~$\pm$~0.03 &  50.6 \\
2 & M2 &  0.45~$\pm$~0.03 &  50.8 \\
3 & pn &  1.51~$\pm$~0.07 &  42.5 \\   
\hline  
\end{tabular}  
\tablefoot{\tablefoottext{1}{exposure identifier;}
\tablefoottext{2}{M1 stands MOS1 and M2 for MOS2;}
\tablefoottext{3}{background corrected source count rate in the energy range of 
        0.2$-$12.0~keV for pn and 0.2$-$10.0~keV for MOS, respectively;}
\tablefoottext{4}{accumulated exposure time;}
\tablefoottext{5}{observation identifier.}}
\end{table}