Table 2: The total flux (2-10 keV) as measured adopting the baseline model (described further in the text).
Observation Flux 2-10 keV

in units of 10^-11 erg cm^-2 s^-2

ASCA 1994 $9.24\pm0.26$

ASCA 1996 $7.45\pm0.21$

BeppoSAX 1998 $9.30\pm0.07$

Chandra 2000 $9.66\pm0.11$

XMM 05/2001 $8.08\pm0.01$

XMM 12/2001 $7.12\pm0.02$

**Table 2:** The total flux (2-10 keV) as measured adopting the baseline model (described further in the text).
Observation	Flux 2-10 keV
	in units of 10^-11 erg cm^-2 s^-2
ASCA 1994	$9.24\pm0.26$
ASCA 1996	$7.45\pm0.21$
BeppoSAX 1998	$9.30\pm0.07$
Chandra 2000	$9.66\pm0.11$
XMM 05/2001	$8.08\pm0.01$
XMM 12/2001	$7.12\pm0.02$

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