\begin{table}%t3
  \caption{\label{table:model_gauss}  Averaged continuum and identified broad Gaussian lines below 6~keV.}    
%\centerline
{\begin{tabular}{l c c}          
                                      \hline\hline                        
Parameters  &
Single Fe-K$\alpha$ &
\ion{Fe}{xxv}-\ion{Fe}{xxvi}  \\
  &
Em. Line &
Blending \\
\hline\noalign{\smallskip}                        
$N_{\rm H}$  (10$^{22}$ cm$^{-2}$)&  
$\rm 0.735 ^{+0.006}_{-0.003}$&
$\rm 0.736 ^{+0.005}_{-0.004}$\\
%&&\\
$kT_{\rm BB}$ (keV)         &
$\rm 1.792 ^{+0.006}_{-0.019}$&
$\rm 1.787 ^{+0.015}_{-0.014}$\\
 $N_{\rm BB}$ (10$^{-1}$) &
$\rm 1.052 ^{+0.017}_{-0.009}$&
$\rm 1.057 ^{+0.012}_{-0.014}$\\
%&&\\
$kT_{\rm DISKBB}$ (keV)         &
$\rm 1.05^{+0.02}_{-0.03}$&
$\rm 1.04 \pm 0.03$\\
$N_{\rm DISKBB}$  &
$\rm 210^{+10}_{-30} $&
$220 \pm 20 $\\
%&&\\
$E_{1~{\rm keV}}$ (keV) &
  $\rm 1.051^{+0.006}_{-0.015}$&
 $\rm 1.051^{+0.006}_{-0.015}$  \\
$\sigma_{1~{\rm keV}}$ (eV) &
$\rm 90^{+11}_{-8}$   &
$\rm 85^{+12}_{-6}$  \\
$I_{1~{\rm keV}}$ (10$^{-3}$ ph cm$^{-2}$ s$^{-1}$) & 
$25 \pm 3$   &
$24^{+4}_{-2}$   \\
Equiv. width (eV) & 
$\rm 22^{+4}_{-3}$  &
$21 \pm 2$  \\
significance ($\sigma$) &
14 &
18 \\
%&&\\
$E_{{\rm S} \; {\rm XVI}}$ (keV) &
2.62 (fixed)  &
2.62 (fixed)  \\
$\sigma_{{\rm S} \; {\rm XVI}}$ (eV) &
140 (fixed)  &
140 (fixed)  \\
$I_{{\rm S} \; {\rm XVI}}$ (10$^{-3}$ ph cm$^{-2}$ s$^{-1}$) & 
$\rm 2.3^{+0.9}_{-0.5}$   &
$\rm 2.5^{+0.7}_{-0.6}$   \\
Equiv. width (eV) & 
$6 \pm 2$  &
$6 \pm 2$  \\
significance ($\sigma$) &
7 &
7 \\
%&&\\
$E_{{\rm Ar} \; {\rm XVIII}}$ (keV) &
$\rm 3.33^{+0.03}_{-0.04}$  &
$\rm 3.32 ^{+0.03}_{-0.04}$  \\
$\sigma_{{\rm Ar} \; {\rm XVIII}}$ (eV) &
$\rm 190^{+70}_{-40}$  &
$\rm 200^{+60}_{-50}$  \\
$I_{{\rm Ar} \; {\rm XVIII}}$ (10$^{-3}$ ph cm$^{-2}$ s$^{-1}$) & 
$\rm 3.7^{+1.7}_{-0.4}$   &
$\rm 4.0^{+1.4}_{-1.1}$   \\
Equiv. width (eV) & 
$12 \pm 5$  &
$\rm 14^{+4}_{-5}$  \\
significance ($\sigma$) &
15 &
6 \\
%&&\\
$E_{{\rm Ca} \; {\rm XIX}}$ (keV) &
$\rm 3.93^{+0.03}_{-0.02}$ &
$3.93 \pm 0.02$ \\
$\sigma_{{\rm Ca} \; {\rm XIX}}$ (eV) &
$\rm 100^{+50}_{-30}$  &
$\rm 110^{+50}_{-20}$  \\
$I_{{\rm Ca} \; {\rm XIX}}$ (10$^{-3}$ ph cm$^{-2}$ s$^{-1}$) & 
$\rm 2.2^{+0.7}_{-0.4}$   &
$\rm 2.3^{+0.6}_{-0.4}$   \\
Equiv. width (eV) & 
$9 \pm 3$  &
$\rm 9^{+3}_{-2}$  \\
significance ($\sigma$) &
9 &
9 \\
%&&\\ 
$\chi_{\rm red}^2({\rm d.o.f.})$ &
$1.51(269)$  &
$1.51(268)$  \\
 \hline                                            
\end{tabular}}
\smallskip
\par
Note. Best-fit values of the parameters obtained
for the averaged spectrum fitting the
emission features with Gaussian profiles.   Uncertainties are  at the  90\% 
confidence
level for a single parameter.   
The parameters are defined as in XSPEC. The continuum emission is fitted with 
a {\tt blackbody} plus a multicolored disk blackbody, {\tt diskbb}. 
The four broad emission features are modelled adopting {\tt Gaussian} 
components.  All components are subject to interstellar absorption. 
\end{table}