\begin{table}%T2
%\centering
\small
\caption{Observing log; SCG~2159-3210 has not been observed by us in the optical and related results are taken from the literature.}
\label{optobs}
\begin{tabular}{ccccccc}
\hline\hline
Group           & Date of observations & Telescope and instrument & Filter & Pixel scale & Exposure time & Zero-Point \\
                &              &                       &              & (arcsec)    & (s) &             \\\hline
SCG~2353-6101  & August 1996  & Danish 1.54~m+DFOSC    & ESO\#452 (R) &   0.39      &  3 $\times$ 200  & 23.92 $\pm$ 0.03 \\
SCG~0018-4854  & August 1996  & Danish 1.54~m+DFOSC    & ESO\#452 (R) &   0.39      &  3 $\times$ 200  & 23.92 $\pm$ 0.03 \\
SCG~0122-3819  & August 1996  & Danish 1.54~m+DFOSC    & ESO\#452 (R) &   0.39      &  3 $\times$ 200  & 23.92 $\pm$ 0.03 \\
SCG~0141-3429  & January 2006 & 3.6~m telescope+EFOSC2 & ESO\#642 (R) &   0.32      &  5 $\times$ 90   & 26.20 $\pm$ 0.02 \\
SCG~0227-4212  & August 1996  & Danish 1.54~m+DFOSC    & ESO\#452 (R) &   0.39      &  3 $\times$ 200  & 23.92 $\pm$ 0.03 \\ \hline
\end{tabular}
\end{table}