**Table 2:** Spectral parameters as derived from fitting simultaneously the EPIC PN and MOS phase-averaged spectra, those at pulse maximum and minimum as well as from the fits to the RGS1 and RGS2 averaged spectra. Quoted errors refer to 90 $\%$ confidence level for the parameter of interest.
	EPIC			RGS
	Average	Pulse maximum	Pulse minimum	Average	Average
F_2-10^a	3.36 $\pm$ 0.02	3.84 $\pm$ 0.05	2.65 $\pm$ 0.06
$N_{\rm H}^{b}$	$\rm 5.9^{+0.7}_{-0.4}$	5.2 $\pm$ 0.6	$\rm 6.7^{+0.9}_{-1.0}$	5.9 (fixed)	$\rm 11.0^{+3.0}_{-2.0}$
$kT_{\rm max}[{\rm keV}]$	19 $\pm$ 3	$\rm 19^{+5}_{-3}$	$\rm 18^{+3}_{-2}$	19 (fixed)	19 (fixed)
$\alpha$	$\rm0.72^{+0.10}_{-0.08}$	0.74 $\pm$ 0.1	0.72 (fixed)	0.72 (fixed)	0.72 (fixed)
$A_{\rm Z}^{c}$	0.59 $\pm$ 0.10	0.59 (fixed)	0.59 (fixed)	0.59 (fixed)	0.59 (fixed)
$C_{\rm nor.}^{d}$ [10^-3]	$\rm 5.1^{+0.4}_{-0.3}$	$\rm 6.0^{+0.6}_{-0.7}$	3.9 $\pm$ 0.1	3.9 $\pm$ 0.2	$\rm 4.6^{+0.4}_{-0.5}$
EW^e	$\rm 50^{+34}_{-40}$	27(<80)	100(<150)
$\chi^2_{\nu}$ ( $\chi^2$ /d.o.f.)	1.02 (1082/1058)	0.91 (561/615)	0.81 (279/344)	0.96 (200/209)	0.92 (191/208)

^a Flux in units of $10^{-12}~\rm erg~cm^{-2}~s^{-1}$ in the 2-10 keV band.
^b Column density of the absorber in units of 10²⁰ cm^-2.
^c Metal abundance in units of the cosmic value (Anders & Grevesse 1989).
^d Normalization constant of CEMEKL model.
^e Equivalent width of the 6.4 keV fluorescent iron line in units of eV.

Source LaTeX | All tables | In the text

	1 Introduction
	2 The observations
	3 X-ray timing analysis
	4 Optical and UV timing analysis
	5 The X-ray spectra
	6 Discussion
	7 Conclusions
	References