\begin{table}%T1
%\centering
\par
\caption{The observed AGNs with the coordinates, redshift, central
wavelength and exposition.}\label{t1}
\begin{tabular}{cccccccc}
\hline\hline
Object & RA & Dec & $z$ & Central    & Date of     & Number of & Exposures
\\
name   & h m s    &$\circ$ $'$ ${''}$    &   & wavelength ({\AA}) &
observation & spectra & s \\
\hline
Mrk 1040 &  2:28:14.3 & +31:18:40.4 & 0.016652 & 6742.3 & 24-Jan.-02 & 4 & 600 \\
 & & & &    4901.6 & 25-Jan.-02 & 4 & 1400 \\
\hline
3C 120 &  4:33:11.2 & +05:21:27.4 & 0.033010 & 6742.3 & 24-Jan.-02 & 4 & 450 \\
 & & & &    5027.9 & 22-Jan.-02 & 3 & 900 \\
\hline
NGC 3227 & 10:23:29.6 & +19:52:15.2 & 0.003839 & 6742.3 & 24-Jan.-02 & 4 & 480 \\
 & & & &    4899 & 25-Jan.-02 & 3 & 600 \\
\hline
PG 1116+215 & 11:19:08.7 & +21:19:33.9 & 0.175700 & 5718.5 & 23-Jan.-02 & 3 & 1200 \\
 & & & &    7699.1 & 24-Jan.-02 & 3 & 500 \\
\hline
NGC 4253 & 12:18:26.1 & +29:48:57.5 & 0.012929 & 4475.6 & 23-Jan.-02 & 4 & 1200 \\
 & & & &    6742.3 & 24-Jan.-02 & 8 & 460, 500 \\
\hline
Mrk 110 & 9:25:11.3 & +52:17:29.4 & 0.035291 & 5027.9 & 22-Jan.-02 & 3 & 1200, 1500 \\
 & & & &    6742.3 & 24-Jan.-02 & 4 & 720 \\
\hline
Mrk 141 & 10:19:10.0 & +63:58:36.6 & 0.041673 & 6744.8 & 24-Jan.-02 & 4 & 800 \\
\hline
3C 273 & 12:29:08.7 & +02:03:46.7 & 0.158339 & 5669.4 & 25-Jan.-02 & 2 & 550 \\
 & & & &    7699.1 & 24-Jan.-02 & 3 & 500 \\
\hline
Mrk 817 & 14:36:20.5 & +58:48:14.6 & 0.031455 & 4904.3 & 25-Jan.-02 & 3 & 550 \\
 & & & &    6742.3 & 24-Jan.-02 & 3 & 500 \\
\hline
Mrk 493 & 15:59:09.6 & +35:02:21.1 & 0.031328 & 6742.3 & 24-Jan.-02 & 3 & 360 \\
\hline
Mrk 841 & 15:04:03.3 & +10:26:48.1 & 0.036422 & 6742.3 & 24-Jan.-02 & 3 & 450 \\
 & & & &    4901.6 & 25-Jan.-02 & 6 & 300 \\
\hline
PG 1211+143 & 12:14:19.4 & +14:03:44.0 & 0.080900 & 5027.9 & 22-Jan.-02 & 3 & 600 \\
 & & & &    6742.3 & 24-Jan.-02 & 3 & 500 \\
\hline
\end{tabular}
\end{table}