\begin{table}%t1
%\centering
\par
\caption{\label{tab:obs}Details of the VLBA observations of J1128+592.}
\small \begin{tabular}{cccc}
\hline \hline
  & Epoch & $\nu$ [GHz] & Participating antennas \\
\hline
& 2004.047 & 5 & all \\
& 2004.211 & 5 & all \\
& 2004.386 & 5 & all \\
& 2004.545 & 5 & all \\
& 2004.706 & 5 & all except KP \\
& 2004.884 & 5 & all \\
\hline
A & 2007.540 & 5/8/15 & all, except HN at 15~GHz \\
B & 2007.661 & 5/8/15 & all, except HN \\
C & 2007.773 & 5/8/15 & all, except SC \\
D & 2007.907 & 5/8/15 & all, except SC and PT \\
E & 2008.025 & 5/8/15 & all \\
F & 2008.137 & 5/8/15 & all \\
\hline
\end{tabular}
\end{table}