**Table 4:** Absorption features in EPIC-pn spectra.
Parameters	14 March 2005	15 March 2005	16 March 2005
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	Fe XXV K $\alpha$ (E₀ 6.700 keV)/Fe XXVI K $\alpha$ (E₀ 6.952/6.973 keV)
v (km s^-1)^b	-5200 $\pm$ 2600	-400 $\pm$ 2700	-2200 $\pm$ 2200
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	Fe XXV K $\beta$ (E₀ 7.872/7.881 keV)/Fe XXVI K $\beta$ (E₀ 8.246/8.252 keV)
v (km s^-1)^b	- 5900 $\pm$ 2200	1200 $\pm$ 5700	-700 $\pm$ 3800

^a Based on CHIANTI data base (Dere et al. 1997; Landi et al. 2006);
^b Blueshift with respect to Fe XXV lines.