\begin{table}%t3
\caption{Correlations summary.}\label{tabcorr}
\small %\centerline
 {
\begin{tabular}{c c c c c c c c c }
\hline\hline
Var. A    & Var. B  & N. objects & $r$  & $\rho$ &  $P(\rho)$ & Slope &  $q$ &   rms  \\
\hline  \noalign{\smallskip}                                       
$P_{\rm B}$  & $P_{\rm j}$ & 23 & 0.84   &  0.76  &  $3\times10^{-5}$   &  $1.10 \pm 0.11$ &--$1.91 \pm 0.20$  & 0.40  \\
$P_{\rm B}^{*}$& $P_{\rm j}^{*}$ &  9 & 0.94   &  0.93  &   0.0003 & $1.33\pm0.11$  & --2.18          &  0.20 \\  
kT  & P$_{\rm j}$   & 23 & --0.04 & --0.08  &   0.73  &  --$1.25\pm0.66$ & --0.06   &  0.82 \\
$n_{\rm e}$      & $P_{\rm j}$  & 23 & 0.34     &  0.29  &   0.18  &  $1.13\pm0.21$  & --0.17           &  0.77 \\
$M_{\rm BH}$ & P$_{\rm j}$   & 23 & 0.59     &  0.60  &   0.002 &  $2.01 \pm 0.23$  & --17.6 &  0.66 \\
$M_{\rm BH}$ & P$_{\rm j}$   & 44 & 0.46     &  0.48  &   0.001 &  $2.05\pm0.20$  & --17.4 &  0.94 \\
${\cal S}_{1~{\rm kpc}}$& $P_{\rm j}$& 43& 0.73     &  0.72  &   $8\times10^{-8}$ &$1.17 \pm 0.11$ &  4.89           &  0.67  \\
 \hline
\end{tabular}}
\smallskip
Columns~(1) and (2) the correlated variables; Col.~(3) the number of objects used;
Col.~(4) the linear correlation coefficient $r$; Col.~(5) the Spearman's rank
correlation~$\rho$ and (6) the probability of no correlation between the
variables; Col.~(7) the slope of the correlation; Col.~(8) the intercept~$q$;
Col.~(9) the rms scatter from the correlation. *~: $P_{\rm B}$--$P_{\rm j}$ relation
using only data from the 9~objects in \citet{allen06}.
\end{table}