\begin{table}%T2
\caption{Best-fitting spectral parameters in the 2.5--12~keV energy range
 for an absorbed ($N_{\rm H}=1.88\times10^{20}$~cm$^{-2}$) 
power-law (PL) component plus a line profile: 
GA: Gaussian profile; and {\sc diskline} and {\sc laor}: profile line
emitted by a relativistic accretion disk for a non-rotating BH and 
 a maximally rotating BH, respectively (Fabian et~al. \cite{Fabian89}; Laor \cite{Laor91}). 
The line fluxes are expressed in erg~cm$^{-2}$~s$^{1}$. 
 We assume an emissivity law $q$ equal to $-$2.
 (a): $R_{\rm in}=6~R_{\rm g}$ and $R_{\rm out}=1~000~R_{\rm g}$, inclination~=~30$^{\circ}$.
 (b): $R_{\rm in}=1.26~R_{\rm g}$ and $R_{\rm out}=400~R_{\rm g}$, inclination~=~30$^{\circ}$. 
(c): The energy of the line has been fixed to 6.4~keV (see text). 
}
\label{tab:line}
%\centering
\par
\begin{tabular}{llll}
\hline
\hline
\noalign {\smallskip}                       
{\small Model}     &    {\small $\Gamma$}            & {\small Line parameters }                          &  {\small $\chi^{2}$/d.o.f.}   \\
\noalign {\smallskip}                       
\hline
\noalign {\smallskip}                       
{\small PL }                       & {\small $1.98\pm0.08$} &                                              & {\small 152.1/150} \\ 
\noalign {\smallskip}                       
\hline
\noalign {\smallskip}                       
{\small PL}          & {\small $2.03\pm0.09$}    & {\small $E=\rm 6.37^{+0.18}_{-0.13}$~keV } & {\small 134.9/147} \\ 
\noalign {\smallskip}                       
{\small + GA}                            &                     & {\small $\sigma=0.23^{+0.19}_{-0.11}$~keV}   &           \\
\noalign {\smallskip}                       
                           &                                          &  {\small $F=\rm 9.6\pm4.0\times10^{-6}$}             &           \\
\noalign {\smallskip}                       
                           &                                          &  {\small $EW\rm =275^{+164}_{-113}$~eV}             &           \\
\noalign {\smallskip}                       
\hline
\noalign {\smallskip}                       
{\small PL } & {\small $2.03\pm0.09$} & {\small $F=8.4\pm3.6\times10^{-6}$} & {\small 137.2/149}  \\
\noalign {\smallskip}                       
{\small + {\sc diskline}$^{(\rm a,c)}$}          &                        & {\small $EW=292\pm124$~eV}                & \\  
\noalign {\smallskip}                       
\hline
\noalign {\smallskip}                       
{\small PL} & {\small $2.02\pm0.09$} & {\small $F=6.7\pm3.6\times10^{-6}$}  & {\small 135.9/149 } \\
\noalign {\smallskip}                       
 {\small + {\sc laor}$^{(\rm b,c)}$}      &                        &  {\small $EW=229\pm94$~eV }              & \\  
\hline
\end{tabular}
\end{table}