\begin{table}%t2
\caption{Fractional entropy and pressure scatter obtained using the surface brightness peak (SB~peak) and the center of large scale X-ray isophotes (SB~center) as center of symmetry.}
\label{tab2}
\small%\centerline
{
\begin{tabular}{c c c c}
\hline
\hline
%&&& \\[-8pt]
Region $^a$ & Center & Entropy & Pressure  \\
\hline
$r<0.1 r_{500}$ & SB peak & $(0.179 \pm 0.011)$ & $(0.629 \pm 0.011)$ \\
                & SB center & $(0.193 \pm 0.008)$ & $(0.667 \pm 0.012)$ \\
\hline
$r<0.2 r_{500}$ & SB peak & $(0.180 \pm 0.006)$ & $(0.413 \pm 0.006)$ \\
                & SB center & $(0.161 \pm 0.005)$ & $(0.448 \pm 0.007)$ \\
\hline
$r<0.5 r_{500}$ & SB peak & $(0.227 \pm 0.010)$ & $(0.276 \pm 0.009)$ \\
                & SB center & $(0.233 \pm 0.012)$ & $(0.272 \pm 0.007)$ \\
\hline
\end{tabular}}
\medskip
$^a$ Circular region inside which the scatter is calculated. The radius is expressed in fraction of~$r_{500}$: radius inside which the  cluster mass density is 500~times the critical density of the universe.
\end{table}