\begin{table}%t3
\caption{\label{radii}Background and source radii used for the extraction of {\it XMM-Newton}/EPIC spectra. }
\small%\centering
\par
\begin{tabular}{lllllll}
\hline\hline\noalign{\smallskip}
Object & Instrument &  Source & Background & Instrument &  Source & Background \\
\hline\noalign{\smallskip}
UGC~3142  & EPIC/PN & 34.5$''$ & 48.1$''$ & EPIC/MOS & 32.2$''$ & 62$''$ \\
ESO~383-18  & EPIC/PN & 37$''$ & 43.6$''$ & EPIC/MOS & 24.2$''$ & 47.8$''$ \\
ESO~140-43$^1$  & EPIC/PN & 36.7$''$ & 52.9$''$ & EPIC/MOS & 37.5$''$ & 66$''$ \\
ESO~140-43$^2$  & EPIC/PN & 34$''$ & 61.7$''$ & EPIC/MOS & 26.5$''$ & 50$''$ \\
\hline
\end{tabular}
\tablefoot{The index 1 refers to the 2005 observation of ESO~140-43, index 2 to the 2006 observation.}
\vspace*{2mm}
\end{table}