\begin{table}%t1
%\centering
\par
\caption{\label{TSOU} PG-name, redshift and Galactic
 column density.  The redshifts are taken from    V\'eron-Cetty \& V\'eron  (\cite{Veron2000}).}
\begin{tabular}{lcl}
\hline\hline  
Target & $z$ & $N_{{\rm H}\;\;\rm Gal.}$ \\
       &           & [$10^{20}~\rm cm^{-2}$]        \\  
\hline   
PG~1001+054 & 0.161 & $1.88$ (\cite{Elvis1989}) \\
PG~2112+059 & 0.457 & $6.26$ (\cite{Lockman1995})\\
PG~1535+547 & 0.038 & $1.35$ (\cite{Murphy1996})\\   \hline
\end{tabular}
\end{table}