\begin{table}%T3
 \caption{Annuli definitions.}
\label{tbl:annuli}
\small%%\centerline
\par
{
 \begin{tabular}{ccc}
\hline\hline
Annulus & Inner & Outer \\
 & Radius & Radius \\
\hline
1 & $0'$    & $0.5'$ \\
3 & $0.5'$  & $1'$ \\
3 & $1'$    & $2'$ \\
4 & $2'$    & $3'$ \\
5 & $3'$    & $4'$ \\
6 & $4'$    & $5'$ \\
7 & $5'$    & $7'$ \\
8 & $7'$    & $9'$ \\
9 & $9'$    & $12'$ \\
10 & $12'$  & $14'$ \\
\hline
\end{tabular}}
\smallskip
Inner and outer radii in arc minutes of the annuli 
used in the analysis of the clusters presented here.
\end{table}