\begin{table}%t1
\par
\caption  {\label{tbl:gcas_4T}Spectral fit results using the 3-T and 4-T models.}   
%\centerline
 {          
\begin{tabular}{r c c c c }   
\\[-0.5ex]        
\hline                    
\hline\\[-2.2ex]
&\multicolumn{2}{c}{Hot component, 1-col.} && Hot component, 2-col.\\
\cline{2-3} \cline{5-5}\\[-2.2ex]
& 3-T & 4-T && 3-T\\ 
& (M1) & (M2) && (M3)\\ 
\hline\\[-2.2ex]
$N_{\rm H_{a}}$ (10$^{22}$ cm$^{-2}$)    	 	&	$\rm 0.22^{+0.04}_{-0.03}$		 & $\rm 0.24^{+0.04}_{-0.04}$	&&	$\rm 0.24^{+0.04}_{-0.04}$ \\[0.8ex]
$kT_{1}$ (keV)				    	&	$\rm 0.10^{+0.01}_{-0.01}$		 & $\rm 0.11^{+0.01}_{-0.01}$	 &&	$\rm 0.11^{+0.01}_{-0.01}$\\[0.2ex]
$f_{{\rm T}_{1}}$ (erg cm$^{-2}$ s$^{-1}$)	    	&	$\sim$1.6~$\times$~10$^{-11}$ (7.3\%)	 & $\sim$1.9~$\times$~10$^{-11}$ (8.4\%)  &&		$\sim$1.8~$\times$~10$^{-11}$ (8.0\%)\\[0.2ex]
EM$_{\rm T_{1}}$ (10$^{55}$ cm$^{-3}$)	    	 	&	$\sim$0.5 (11.5\%)			 & $\sim$0.7 (15.4\%)	&& $\sim$0.6 (12.9\%)		 \\[0.8ex]
$kT_{2}$ (keV)				    	&	$\rm 0.64^{+0.03}_{-0.04}$		 & $\rm 0.64^{+0.03}_{-0.03}$	 &&	$\rm 0.62^{+0.03}_{-0.03}$\\[0.2ex]
$f_{{\rm T}_{2}}$ (erg cm$^{-2}$ s$^{-1}$)	    	&	$\sim$4.0~$\times$~10$^{-12}$ (1.8\%)	 & $\sim$4.2~$\times$~10$^{-12}$ (1.9\%) &&		$\sim$4.0~$\times$~10$^{-12}$ (1.8\%)\\[0.2ex]  
EM$_{\rm T_{2}}$ (10$^{55}$ cm$^{-3}$)	    	 	&	$\sim$0.05 (1.1\%)			 & $\sim$ 0.06 (1.3\%)  && $\sim$0.06 (1.3\%)		 \\[0.8ex]
$kT_{3}$ (keV)				    	&	...				 & $\rm 2.40^{+0.38}_{-0.26}$	 &&	...\\[0.2ex]
$f_{{\rm T}_{3}}$ (erg cm$^{-2}$ s$^{-1}$)		&	...				 & 
$\sim$$1.2\times 10^{-11}$ (5.3\%)  &&	...  \\[0.2ex]
EM$_{\rm T_{3}}$ (10$^{55}$ cm$^{-3}$)	 		&	...				 & $\sim$0.2 (4.4\%)	&&	... \\[0.8ex]
$kT_{Q'}$ (keV)				    	&	...				 & ...	 &&	$\rm 12.38^{+0.30}_{-0.28}$ $^{(*)}$\\[0.2ex]
$f_{{\rm T}_{Q'}}$ (erg cm$^{-2}$ s$^{-1}$)		&	...				 & ...  &&	$\sim$$3.2\times 10^{-11}$ (14.3\%)\\[0.2ex]  
EM$_{{\rm T}_{Q'}}$ (10$^{55}$ cm$^{-3}$)	 		&	...				 & ...	&&	$\sim$0.6 (12.9\%) \\[0.8ex]
$N_{\rm H_{b}}$ (10$^{22}$ cm$^{-2}$)    	 	&	$\rm 0.029^{+0.002}_{-0.002}$	 & $\rm 0.022^{+0.002}_{-0.002}$	 &&	$\rm 0.019^{+0.003}_{-0.003}$\\[0.8ex]
$kT_{Q}$ (keV)				    	&	$\rm 12.55^{+0.31}_{-0.29}$		 & $\rm 14.32^{+0.59}_{-0.55}$	 &&	12.38 $^{(*)}$ \\[0.2ex]
$f_{{\rm T}_{Q}}$ (erg cm$^{-2}$ s$^{-1}$)		&	$\sim$$2.0\times10^{-10}$ (90.9\%)	 & $\sim$1.9~$\times$~10$^{-10}$ (84.4\%)  &&	$\sim$$1.7\times 10^{-10}$ (75.9\%)\\[0.2ex]  
EM$_{{\rm T}_{Q}}$ (10$^{55}$ cm$^{-3}$)	 		&	$\sim$3.8 (87.4\%)			 & $\sim$3.6 (78.9\%)	&& $\sim$3.4 (72.9\%)		 \\[0.2ex]
$Z_{{\rm T}_{Q,Q'}}$ ($Z_{\odot}$)		    	&	$\rm 0.13^{+0.01}_{-0.01}$		 & $\rm 0.10^{+0.02}_{-0.02}$	&&	$\rm 0.12^{+0.01}_{-0.01}$ \\[0.8ex]	 
Line (keV)				     		&	6.4$^b$				 & 6.4$^b$			 &&	6.4$^b$\\[0.2ex]
$\sigma_{\rm Line}$ (keV) 		  		&	0.01		 & 0.01	 &&	$\rm 0.09^{+0.04}_{-0.03}$\\[0.8ex] 
$f_{\rm tot}$ (erg cm$^{-2}$ s$^{-1}$) 			&	$\sim$$2.2\times10^{-10}$	 & $\sim$$2.2\times 10^{-10}$  &&	$\sim$$2.3\times10^{-10}$\\[0.2ex]  
EM$_{\rm tot}$ (10$^{55}$ cm$^{-3}$)                        & $\sim$4.4	& 
$\sim$4.6	&& $\sim$4.7 \\[0.8ex]
$\chi^{2}_{\nu}$/d.o.f.$^{{a}}$	     		&	1.47/1532			 & 1.44/1529	&&	1.46/1530\\[0.2ex]
\hline
                                  \end{tabular}}
\par
 \tablefoot {Fluxes are given unabsorbed in the 0.2--12~keV energy band. 
In parentesis are the fluxes and EM in~\% of the total values. 
Plasmas with solar abundances, except for the [Fe] of the hot component. 
Quoted errors are at the~90\% confidence level.
Base model: 
$N_{\rm H_a}*$($T_1$+$T_2$+$T_3$+$T_{Q'}$) + $N_{\rm H_b}*$($T_Q$); see 
Sect.~\ref{sect:modelfit} for details.\\
 \tablefoottext{a}{Degrees of freedom;}
 \tablefoottext{b}{frozen parameter.}}
\end{table}