Table 2: Best-fit spectral parameters of the time-averaged pn spectrum in the 2-12 keV energy range with an absorbed (Galactic, $N_{\rm H}=6.8\times 10^{20}$ cm^-2) power-law (PL) component plus a line profile: zgauss: Gaussian profile; and DISKLINE and LAOR: line profile emitted by a relativistic accretion disk for a non-rotating black hole (Fabian et al. 1989) and a maximally rotating black hole (Laor 1991), respectively. The line fluxes are expressed in 10^-6 photons cm^-2 s^-1. We assume an emissivity index q equal to -2. (a): $R_{\rm in}=6$ $R_{\rm g}$ and $R_{\rm out}=1000$ $R_{\rm g}$ . (b): $R_{\rm in}=1.235$ $R_{\rm g}$ and $R_{\rm out}=400$ $R_{\rm g}$ .
Model $\Gamma$ Line parameters $\chi^{2}$ /d.o.f. F-test

E (keV) $\sigma$ (keV) $\theta$ (deg) Flux EW (eV)

PL $1.56\pm0.04$ - - - - - 634.0/621 -

PL + zgauss 1.57 $\pm$ 0.04 6.4 (f) 0.01 (f) - 2.2 $\pm$ 1.2 54 $\pm$ 29 624.5/620 99.78 $\%$

PL + zgauss 1.57 $\pm$ 0.04 6.33 $\pm$ 0.05 <0.10 - 2.9 $\pm$ 1.4 $\rm 69^{+36}_{-31}$ 619.6/618 99.74 $\%$

PL + DISKLINE^(A) $1.58\pm0.04$ 6.40 $\pm$ 0.05 - <22 3.9 $\pm$ 1.7 107 $\pm$ 46 619.3/618 99.77 $\%$

PL + LAOR^(b) 1.58 $\pm0.04$ $\rm 6.40^{+0.05}_{-0.10}$ - <22 4.4 $\pm$ 2.1 $\rm 119^{+59}_{-55}$ 621.7/618 99.30 $\%$

**Table 2:** Best-fit spectral parameters of the time-averaged pn spectrum in the 2-12 keV energy range with an absorbed (Galactic, $N_{\rm H}=6.8\times 10^{20}$ cm^-2) power-law (PL) component plus a line profile: zgauss: Gaussian profile; and DISKLINE and LAOR: line profile emitted by a relativistic accretion disk for a non-rotating black hole (Fabian et al. 1989) and a maximally rotating black hole (Laor 1991), respectively. The line fluxes are expressed in 10^-6 photons cm^-2 s^-1. We assume an emissivity index q equal to -2. (a): $R_{\rm in}=6$ $R_{\rm g}$ and $R_{\rm out}=1000$ $R_{\rm g}$ . (b): $R_{\rm in}=1.235$ $R_{\rm g}$ and $R_{\rm out}=400$ $R_{\rm g}$ .
Model	$\Gamma$	Line parameters	$\chi^{2}$ /d.o.f.	F-test
		E (keV)	$\sigma$ (keV)	$\theta$ (deg)	Flux	EW (eV)
PL	$1.56\pm0.04$	-	-	-	-	-	634.0/621	-
PL + zgauss	1.57 $\pm$ 0.04	6.4 (f)	0.01 (f)	-	2.2 $\pm$ 1.2	54 $\pm$ 29	624.5/620	99.78 $\%$
PL + zgauss	1.57 $\pm$ 0.04	6.33 $\pm$ 0.05	<0.10	-	2.9 $\pm$ 1.4	$\rm 69^{+36}_{-31}$	619.6/618	99.74 $\%$
PL + DISKLINE^(A)	$1.58\pm0.04$	6.40 $\pm$ 0.05	-	<22	3.9 $\pm$ 1.7	107 $\pm$ 46	619.3/618	99.77 $\%$
PL + LAOR^(b)	1.58 $\pm0.04$	$\rm 6.40^{+0.05}_{-0.10}$	-	<22	4.4 $\pm$ 2.1	$\rm 119^{+59}_{-55}$	621.7/618	99.30 $\%$

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