\begin{table}%t1
\caption{\label{tab1}Journal of observations.}
%\centerline
 {\small \begin{tabular}{l c c c l}
\hline\hline
\multicolumn{1}{c}{Source} & \multicolumn{1}{c}{$z^a$} &
\multicolumn{1}{c}{$E(B-V)^b$} & \multicolumn{1}{c}{${\rm Exp.}^c$} &
\multicolumn{1}{c}{Date}\\
\hline\noalign{\smallskip}
TN J0121$+$1320& 3.516&	0.039&	23~400& 2005 Oct. 28, Nov. 20,\\
&  & & & 2006 Sep. 17, 20\\
TN J0205$+$2242& 3.506&	0.100&	5400&	2005 Oct. 1\\
MRC 0316$-$257&	 3.130&	0.014&	10~800&	2006 Jul. 27, Aug. 25, Oct.~2\\
USS 0417$-$181& 2.773&	0.048&	2700&	2006 Oct. 2\\
TN J0920$-$0712& 2.760&	0.041&	10~800&	2006 Apr. 3, 4\\
WN J1123$+$3141& 3.217&	0.018&	14~400&	2005 Dec. 28,\\
& &	 &	 &	 2006 Apr. 5, May 27, Jun. 20\\
4C 24.28& 2.879&	0.018&	10~800&	2006 Apr. 23\\
USS 1545$-$234&		2.755&	0.257&	14~400&	2006 Apr. 5, 23, 24\\
USS 2202$+$128&		2.706&	0.067&	10~800&	2006 Jul. 2, Aug. 16\\
\hline
\end{tabular}}
\medskip
$^a$~The redshift based on NED (NASA/IPAC Extragalactic Database);
$^b$~galactic extinction [mag] given by Schlegel et~al. (\cite{Schlegel1998});  $^c$~total exposure time~[s].
\end{table}