\begin{table}%t2
\caption{\label{tab2}$K_{\rm s}$-band magnitudes of  the candidate counterparts shown in
Fig.~\ref{fig1},  measured for the  two nights.   }
%\centerline
{\begin{tabular}{cccc} 
\hline\hline
 Source ID            & $\Delta r$ & 2007-07-08 &  2007-07-12  \\ \hline
 1 &  0\farcs50 & $\ge$20.1       & 20.27 $\pm$ 0.05  \\
 2 &  0\farcs54 & 18.65 $\pm$ 0.08 & 18.51 $\pm$ 0.03  \\
 3 &  0\farcs76 & 16.22 $\pm$ 0.05 & 16.23 $\pm$ 0.03  \\
 4 &  0\farcs74 & 18.56 $\pm$ 0.06 & 18.54 $\pm$ 0.03  \\ \hline
\end{tabular}}
\par
The second column gives the source angular distance  from the nominal radio position of \ONEE. Only statistical  errors ($1 \sigma$) are listed.  In all cases, the actual photometry error has to account for the zero point  error (0.02~mag) and, for the night
of July 8th, also for the rms of our relative photometry recalibration
(0.12~mag).
\end{table}