\begin{table}%t8
  \caption{$B$-magnitude (not corrected by reddening) and $(B-R)$ color of some of the background galaxies (bg) found in the area surrounding Mkn 1087. The objects belonging to the non-catalogued cluster (cl) show redder colors.}
  \label{table8}  
%\centering
\par
  \begin{tabular}{ccc}
    \hline\hline
   Object &   $m_B$  &  $(B-R)$ \\
    \hline
    bg1    & 18.49 $\pm$ 0.08  &  0.61 $\pm$ 0.12 \\
	bg2    & 19.21 $\pm$ 0.08  &  0.36 $\pm$ 0.12 \\
	bg3    & 19.43 $\pm$ 0.08  &  0.29 $\pm$ 0.12 \\
	bg4    & 19.67 $\pm$ 0.08  &  0.70 $\pm$ 0.12 \\
	bg5    & 20.6 $\pm$ 0.1    &  0.4 $\pm$ 0.2 \\    
	bg6    & 21.5 $\pm$ 0.2    &  0.4 $\pm$ 0.3 \\
	bg7    & 21.6 $\pm$ 0.2    &  0.1 $\pm$ 0.3 \\
	bg8    & 21.8 $\pm$ 0.2    &  0.6 $\pm$ 0.3 \\
    \hline
	cl1    & 20.8 $\pm$ 0.1    &  1.1 $\pm$ 0.2 \\  
	cl2    & 21.8 $\pm$ 0.2    &  1.0 $\pm$ 0.3 \\
	cl3    & 21.9 $\pm$ 0.2    &  1.8 $\pm$ 0.3 \\
	cl4    & 22.0 $\pm$ 0.2    &  2.3 $\pm$ 0.3 \\
	cl5    & 22.5 $\pm$ 0.2    &  2.7 $\pm$ 0.3 \\
	cl6    & 23.2 $\pm$ 0.3    &  2.8 $\pm$ 0.5 \\ 
\hline
  \end{tabular}  
 \end{table}