\begin{table}%t4
\caption{\label{table:4}Details of EVN observations.}     
%\centerline
 {          
\begin{tabular}{cccccccc}
\hline\hline
Observing & Date & Duration& Telescopes$^*$ & Cycle time & Spectral channel  & Synthesized & Rms noise\\
run       &      &         &               &             & separation & beam($\alpha\times\delta$; PA)& per channel\\
          &      & (h)    &               & (min)       &  (km~s$^{-1}$)& (mas~$\times$~mas;\degr)& (mJy~beam$^{-1}$)\\
\hline                   
1         & 2003 Jun. 08& 12& CmJbEfOn          & 6.00$+$4.00& 0.09 &6~$\times$~16; $-$1& 10\\
2         & 2004 Nov. 11& 12& CmDaEfMcNtOnTrWb  & 3.75$+$1.75& 0.09 &6~$\times$~16; $+$7& 4\\
3a        & 2006 Feb. 22& 10& CmJbEfHhMcNtOnWb  & 3.75$+$1.75& 0.09 &5~$\times$~15;$+$31& 10\\
3b        & 2006 Feb. 23& 10& CmJbEfHhMcOnWb    & 3.75$+$1.75& 0.09 &6~$\times$~14;$+$34& 7\\
4a        & 2007 Jun. 13& 10& CmJbEfHhMcNtOnTrWb& 3.25$+$1.75& 0.18 &6~$\times$~12;$+$20& 4\\
4b        & 2007 Jun. 14& 10& CmJbEfHhMcNtOnTrWb& 3.25$+$1.75& 0.18 &6~$\times$~11;$+$25& 4\\
4c        & 2007 Jun. 15& 10& CmJbEfMcNtOnTrWb  & 3.25$+$1.75& 0.09 &6~$\times$~13;$+$35& 6\\
\hline
   \end{tabular}              }
   \smallskip
$^*$ Cm-Cambridge, Da-Darnhall, Jb-Jodrell Bank,
Ef-Effelsberg, Hh-Hartebeesthoek, Mc-Medicina, Nt-Noto, On-Onsala,
Tr-Toru\'n, 
\mbox{Wb-Westerbork}.
\par
\end{table}