\begin{table}%t2
%\centering
\par
\caption {Best-fit spectral parameters of the time-averaged pn spectrum 
  in the 2--12~keV energy range
 with an absorbed (Galactic, $N_{\rm H}=6.8\times10^{20}$~cm$^{-2}$) 
power-law (PL) component plus a line profile: 
 zgauss: Gaussian profile; and {\sc diskline} and {\sc laor}: line profile
emitted by a relativistic accretion disk for a non-rotating black hole
\citep{Fabian89} and  a maximally rotating black hole \citep{Laor91}, respectively. 
The line fluxes are expressed in 10$^{-6}$~photons~cm$^{-2}$~s$^{-1}$. 
 We assume an emissivity index~$q$ equal to $-$2.
 (a): $R_{\rm in}=6$~$R_{\rm g}$ and $R_{\rm out}=1000$~$R_{\rm g}$.
 (b): $R_{\rm in}=1.235$~$R_{\rm g}$ and $R_{\rm out}=400$~$R_{\rm g}$.\label{tab:line}}
\begin{tabular}{lllllllll}
\hline
\hline
\noalign {\smallskip}                       
{\small Model}      &  \multicolumn{1}{c}{\small $\Gamma$} &\multicolumn{5}{c}{\small Line parameters}&{\small $\chi^{2}$/d.o.f.} &   F-test   \\
                   &                    &  \multicolumn{1}{c}{$E$ (keV)}    &  \multicolumn{1}{c}{$\sigma$ (keV)} &  \multicolumn{1}{c}{$\theta$ (deg)} & \multicolumn{1}{c}{Flux}  & \multicolumn{1}{c}{$EW$ (eV)} \\
                   \hline
%
{\small PL }       & {\small $1.56\pm0.04$}&   \multicolumn{1}{c}{ -- } &   \multicolumn{1}{c}{ -- } &   \multicolumn{1}{c}{ -- } &   \multicolumn{1}{c}{ -- }   &    \multicolumn{1}{c}{ -- }       &     {\small 634.0/621} & \multicolumn{1}{c}{ -- }\\ 
{\small PL + zgauss}       & {\small 1.57~$\pm$~0.04} & {\small 6.4 (f)} &  0.01 (f)  &    \multicolumn{1}{c}{ -- }  &  {\small 2.2~$\pm$~1.2}   &  {\small 54~$\pm$~29}     &         {\small 624.5/620}&   99.78$\%$ \\ 
{\small PL + zgauss}       & {\small 1.57~$\pm$~0.04} & {\small 6.33~$\pm$~0.05 } & {\small $<$0.10} &    \multicolumn{1}{c}{ -- }  &  {\small 2.9~$\pm$~1.4} &  {\small $\rm 69^{+36}_{-31}$} &  {\small 619.6/618}&   99.74$\%$  \\ 
{\small PL + {\sc diskline$^{(a)}$}} & {\small $1.58\pm0.04$} & {\small 6.40~$\pm$~0.05} &    \multicolumn{1}{c}{ -- }  & {\small $<$22}& {\small 3.9~$\pm$~1.7} & 107~$\pm$~46 & {\small 619.3/618} & 99.77$\%$ \\
{\small PL  + {\sc laor}$^{(b)}$} & {\small 1.58$\pm0.04$} & {\small $\rm 6.40^{+0.05}_{-0.10}$} &   \multicolumn{1}{c}{ -- }   & {\small $<$22}& {\small 4.4~$\pm$~2.1} & $\rm 119^{+59}_{-55}$ & {\small 621.7/618} & 99.30$\%$ \\[0.5mm]    
\hline
\end{tabular}
\end{table}