\begin{table}%t6
\caption{\label{regs2308}Definition of regions of interest in RXCJ2308.3-0211.}
\par
\small%\centerline
 {
\begin{tabular}{c c c c c}
\hline\hline
Region & Radius & Angle & Objects & Area \\
\hline
  Cluster core & $0'\leq r \leq3'$ & $0\leq\theta\leq360$ & 258 & 9$\pi$ \\
  Inner outskirts & $3'< r \leq6'$ & $0\leq\theta\leq360$ & 293 & 27$\pi$ \\
  Outer outskirts  & $6'< r \leq9'$ & $0\leq\theta\leq360$ & 429 & 45$\pi$ \\
  BG field (1)  & $9'< r \leq19'$ & $200\leq\theta\leq240$ & 255 & 31.1$\pi$ \\
  BG field (2)  & $9'< r \leq19'$ & $300\leq\theta\leq350$ & 228 & 38.9$\pi$ \\
\hline
\end{tabular}}
\medskip
Areas are expressed in square arcminutes.
\end{table}