\begin{table}%T1
\caption{\label{info_sources}Positions (J2000), redshift and Galactic hydrogen column densities (from Dickey \& Lockman \cite{Dickey1990}) of the three sources analyzed in this work.}
\small%\centering
\par
\begin{tabular}{llllll}
\hline\hline\noalign{\smallskip}
Object & Type &RA &  Dec & $z$ & Galactic $N_{\rm ~H}$\\
& & & & &{ [$10^{21}\rm ~cm^{-2}$]} \\
\hline\noalign{\smallskip}
UGC~3142  & Seyfert 1 &$\rm 04^{~h}43^{~m}46.8^{~s}$ & $+28^{\circ }58'19''$ & 0.0217 & 1.9 \\
ESO~383-18  & Seyfert 2 &$\rm 13^{~h}33^{~m}26.3^{~s}$ & $-34^{\circ }00'59''$ & 0.0124 & 0.42\\
ESO~140-43  & Seyfert 1 &$\rm 18^{~h}44^{~m}54.0^{~s}$ & $-62^{\circ }21'53''$ & 0.0141 & 0.73\\
\hline 
\end{tabular} 
\end{table}