\begin{table}%t1
 \caption{The VLBI observational log.}\label{table1}
%\centerline
{\begin{tabular}{lllllll}
\hline\hline
Object &   $z$ &Epoch &{\it HPBW} & Noise ($3\sigma$) & Peak & Array\\
       &    &      &(mas $\times$ mas,$^\circ$)&(mJy beam$^{-1}$)&(mJy beam$^{-1}$)
&
\\
\hline
1011$+$496&   0.2 &  1997.055  &  $2.5 \times 2.08,~ -8.36$   &  0.60  &116.0      &  1     \\
          &       &  1998.493  &  $2.47 \times 1.72,~-2.76$   &  0.56  &103.0      &  1         \\
          &       &  1999.893  &  $2.8 \times 1.35,~ -38.6$   &  1.83   &81.7       &  2         \\
1133+704  & 0.046 &  1997.055  &  $2.77 \times 2.04,~ -32.5$  &  0.30  &118.0      &  1    \\
          &       &  1998.493  &  $2.72 \times 1.7, ~87.7$    &  0.39  &98.7       &  1         \\
          &       &  1999.893  &  $1.87 \times 1.32, ~-30.4$  &  1.01   &77.5       &  2         \\
1424$+$240&0.16   &  1999.696   &  $2.96 \times 1.92,~ -0.412$ &  0.94  &125.0      &  1     \\
          &       &  1999.893  &  $5.95 \times 1.98,~ 12.8$   &  1.57   &134.0      &  2          \\
          &       &  2003.447  &  $3.02 \times 1.61,~ -8.25$  &  0.60  &164        &  1         \\
1542$+$614& ...   &  1999.893  &  $2.26 \times 1.48,~ 7.24$   &  0.87   &93.4       &  2          \\
4C$+$37.46& 1.271 &  1999.893  &  $4.65 \times 2.17, ~15.7$   &  1.38   &32.2       &  2      \\
1727$+$502& 0.055 &  1995.534  &  $2.12\times 1.87, ~-34.6$   &  0.37   &80.1       &  1     \\
          &       &  1997.055  &  $3.05 \times 2.43, ~3.03$   &  0.35  &85.7       &  1         \\
          &       &  1998.493  &  $2.62 \times 1.52, ~-10.8$  &  0.46  &66.9       &  1         \\
          &       &  1999.893  &  $4.58 \times 2.3, ~4.5$     &  0.93  &81.4       &  2          \\
          &       &  2002.403  &  $2.31 \times 1.64, ~16$     &  0.63  &72.9       &  2          \\
1741$+$196& 0.083 &  1997.055  &  $3.75 \times 2.13, ~11.8$   &  0.37  &103.0      &  1     \\
          &       &  1997.378  &  $3.07 \times 1.67, ~-5.62$  &  0.42  &80.1       &  1          \\
          &       &  1998.493  &  $3.09 \times 1.58, ~-5.37$  &  0.39  &85.4       &  1         \\
          &       &  1999.893  &  $5 \times 1.79, ~16.2$      &  1.14   &98.4       &  2         \\
          &       &  2002.400  &  $7.68 \times 4.92, ~67.8$   &  0.90  &131.0      &  2          \\
          &       &  2003.447  &  $2.98 \times 1.72, ~-6.07$  &  0.41  &100.0      &  1         \\
\hline 
\end{tabular}}
\smallskip
1: VLBA, 2: EVN.
\end{table}