Table 3: Best-fit spectral parameters for the three pn sub-spectra in the 2-10 keV energy range. Column (1): number of the corresponding sub-spectrum (the extraction time range is reported in Fig. 3). Column (2): model used. PL: power-law; zgauss: Gaussian line ($\sigma $ fixed to 10 eV); AN: narrow diskline annulus ( $\Delta R=1$ $R_{\rm g}$; other diskline parameters are discussed in the text, see Sect. 3.2). Column (3): power-law index. Column (4): unabsorbed 2-10 keV flux ( $\times 10^{-12}$ erg cm-2 s-1). Column (5): line parameters.

No.		 Model $\Gamma$ $F^{\rm unabs}_{2-10}$ $E_{\rm line}$ (keV) $\chi^{2}$/d.o.f.
        EW (eV)  
1 PL $1.61\pm0.11$ $3.2\pm0.5$ - 83.8/97
  PL+zgauss 1.64 $\pm$ 0.11 - 5.47 $\pm$ 0.04 71.0/95
        194 $\pm$ 89  
2 PL 1.51 $\pm$ 0.05 3.3 $\pm$ 0.2 - 98.8/97
3 PL 1.61 $\pm$ 0.06 3.1 $\pm$ 0.2 - 117.9/97
  PL+zgauss 1.62 $\pm$ 0.06 - 6.35 $\pm$ 0.05 102.5/95
        128 $\pm$ 53  
  PL+AN 1.64 $\pm$ 0.06 - 6.40 (f) 95.0/93
        287 $\pm$ 100  


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