\begin{table}%t1
\caption{Properties of the spectroscopically investigated UCD~candidates in Abell~1689. "CG'' in the comment column stands for "compact galaxy''. The spectrum of candidate~4 is partially contaminated by a neighbouring irregular galaxy with unkown redshift, see Fig.~\ref{mapcmd}, showing several weak cross-correlation peaks within $0<z<0.30$. The spectrum of candidate is partially contaminated by a dwarf galaxy member of Abell~1689, see Fig.~\ref{mapcmd}, showing several weak cross-correlation peaks within $0.15<z<0.20$.}\label{resspec}
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\par
\begin{tabular}{lllllll}
\hline  \hline
Candidate&RA[2000]&Dec[2000]&$i$&$(g-i)$&$z_{\rm spec}$ & Comment\\\hline
1&13:11:32.75 & $-$01:19:48.9&22.18 &1.64 &0.1859 $\pm$ 0.0008 &new name: CG$_{\rm A1689,1}$\\
2&13:11:29.90 &$-$01:19:22.5 &22.38 &1.75 &75 $\pm$ 260 km~s$^{-1}$&Star \\
3&13:11:33.11 &$-$01:20:05.5 &22.77 &1.74 &0.2014 $\pm$ 0.0007 &new name: CG$_{\rm A1689,2}$\\
4&13:11:31.09 &$-$01:21:14.8 &23.24 &1.51 &$0.00<z_{\rm spec}<0.30$&Possible member (weak, blended)\\
5&13:11:25.73 &$-$01:21:42.1 &23.80 &1.67 &$0.15<z_{\rm spec}<0.20$ &Possible member (weak, blended)\\
\hline
\end{tabular}
\end{table}