\begin{table}%t2
%\centering
\par
     \caption{Observed scaling relations.  For each observable
       set $(B,A)$, we fitted a power law relation of the form 
       $B = C(A/A_0)^\alpha$, with 
       $A_0 = 5~{\keV};  4\times10^{13}~\msol; 2\times10^{14}~\msol~\keV$
        for $\TX$,  $M_{\rm g,500}$ and
       $Y_{\rm X}$ respectively.   $\sigma_{\rm log,r}$ and
       $\sigma_{\rm log,i}$ are the raw and intrinsic scatter about
       the best fitting relation in the $\log$--$\log$ plane. The \MT\
       relation is the same as that given in \cite{app05}. }     \label{tab:rel}
 \small  \begin{tabular}{lcccc}
    \hline    \hline
    Relation &  $\log_{10} C $ & $\alpha$ & $\sigma_{\rm log,r}$&$\sigma_{\rm log,i}$ \\[1mm]% & $\chi^2$\\
    \hline
 $h(z) M_{500}$--$\TX$   &  $14.580 \pm 0.016$ &$1.71 \pm 0.09$ & $0.064$ & $0.039$ \\[1mm]%& 12.7\\
 $h(z)^{2/5} M_{500}$--$Y_{\rm X}$   &  $14.556 \pm 0.015$ &$0.548 \pm 0.027$ & $0.062$ & $0.039$ \\[1mm]%& 14.4\\
$M_{500}$--$M_{\rm g,500}$  &$14.542 \pm 0.015$ &$0.803 \pm 0.040$ & $0.065$ & $0.044$\\[1mm]% & 16.6  \\
 $h(z) M_{{\rm g},500}$--$\TX$   &  $13.651 \pm 0.010$ &$2.10 \pm 0.05$ & $0.048$ & $0.036$ \\[1mm]%& 12.7\\
$h(z)^{2/5} M_{\rm g,500}$--$Y_{\rm X}$  &   $13.619 \pm 0.008$ &$0.678 \pm 0.014$ & $0.017$ & -- \\[1mm]%& 5.7 \\
$f_{\rm g,500}$--$Y_{\rm X}$  &   $-0.939 \pm 0.016$ &$0.133 \pm 0.028$ & $0.067$ & 0.044 \\
     \hline
\end{tabular}
\end{table}