Table 1: Summary of the power-law index and luminosities ( $\times$ 10⁴⁴ erg s^-1) observed by different X-ray satellites in the 2-10 keV energy range over 16 years (5 observations). For a direct comparison, the luminosities have been re-calculated when needed assuming $H_{\rm0}=75$ km s^-1 Mpc^-1 and q₀=0.5. The references (Col. 5) correspond to: RT00 (Reeves & Turner 2000), LT97 (Lawson & Turner 1997).
Satellites Obs. date $\Gamma$ Lum Ref.

(dd/mm/yyyy)

Ginga 02/02/1988 $1.18\pm0.06$ 1.4 LT97

Ginga 21/09/1991 $1.48\pm0.13$ 1.2 LT97

ASCA 29/07/1994 $1.78\pm0.02$ 3.0 RT00

RXTE 21/08/1998 $1.17\pm0.15$ 1.0 This work

XMM-Newton 14/07/2004 $1.56\pm0.04$ 0.98 This work

**Table 1:** Summary of the power-law index and luminosities ( $\times$ 10⁴⁴ erg s^-1) observed by different X-ray satellites in the 2-10 keV energy range over 16 years (5 observations). For a direct comparison, the luminosities have been re-calculated when needed assuming $H_{\rm0}=75$ km s^-1 Mpc^-1 and q₀=0.5. The references (Col. 5) correspond to: RT00 (Reeves & Turner 2000), LT97 (Lawson & Turner 1997).
Satellites	Obs. date	$\Gamma$	Lum	Ref.
	(dd/mm/yyyy)
Ginga	02/02/1988	$1.18\pm0.06$	1.4	LT97
Ginga	21/09/1991	$1.48\pm0.13$	1.2	LT97
ASCA	29/07/1994	$1.78\pm0.02$	3.0	RT00
RXTE	21/08/1998	$1.17\pm0.15$	1.0	This work
XMM-Newton	14/07/2004	$1.56\pm0.04$	0.98	This work

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