\begin{table}%t4
\caption{\label{tab_epic} Absorption features in EPIC-pn spectra.}
%\centerline
 {\begin{tabular}{c c c c}
\hline\hline
\noalign{\smallskip}
Parameters & 14 March 2005 & 15 March 2005 & 16 March 2005 \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
Line energy (keV) 		& 6.82~$\pm$~0.06		& 6.71~$\pm$~0.06	& 6.75~$\pm$~0.05\\
1$\sigma$ line width (eV)	& $\rm 110^{+100}_{-50}$ 	& 200~$\pm$~100 	& 250~$\pm$~50\\
Equivalent width (eV) 		& $\rm 60^{+30}_{-10}$ 	& 100~$\pm$~60	&  110~$\pm$~30 \\
Identification$^{{a}}$	& \multicolumn{3}{c}{Fe~XXV K$\alpha$ ($E_0$ 6.700~keV)/Fe~XXVI K$\alpha$ ($E_0$ 6.952/6.973~keV)} \\
$v$ (km~s$^{-1}$)$^{{b}}$		& --5200~$\pm$~2600 	& --400~$\pm$~2700	&--2200~$\pm$~2200\\
\noalign{\smallskip}
Line energy (keV) 		& 8.04~$\pm$~0.06		& 7.85~$\pm$~0.15		& 7.9~$\pm$~0.1\\
1$\sigma$ line width (eV)  	& $\rm 100^{+100}_{-50}$	& 700~$\pm$~200		& 600~$\pm$~200\\
Equivalent width (eV)      	&$\rm 54^{+1}_{-25}$ 	&  $\rm 230^{+20}_{-50}$	&  240~$\pm$~40\\
Identification$^{{a}}$ & \multicolumn{3}{c}{Fe~XXV K$\beta$ ($E_0$ 7.872/7.881~keV)/Fe~XXVI K$\beta$ ($E_0$ 8.246/8.252~keV)}\\
$v$ (km~s$^{-1}$)$^{{b}}$ 	& -- 5900~$\pm$~2200 	& 1200~$\pm$~5700	& --700~$\pm$~3800\\
\hline
\end{tabular}}
\par
\medskip
$^{{a}}$ Based on CHIANTI data base (Dere~et~al.~\cite{der97}; Landi~et~al.~\cite{lan06});
$^{{b}}$ Blueshift with respect to Fe~XXV lines. 
\end{table}