Table 2: Fits of the BeppoSAX data using a power law plus Galactic absorption model: best fit spectral parameters.
Observation $\Gamma$ $N_{\rm H}$ $\chi^2$ (d.o.f.), proba.

10²⁰ cm^-2

2001 $\rm 1.87^{+0.02} _{-0.03}$ <3.15^p 182.23(139), 0.008

1997 $\rm 1.77^{+0.07} _{-0.06}$ <4.08^p 106.88(99), 0.277

2002 $\rm 1.72^{+0.07} _{-0.07}$ $\rm 3.69^{+2.75} _{-0.79}$ 104.70(99), 0.328

^p Pegged at Galactic value $N_{\rm H}=2.90\times10^{20}$ cm^-2.

**Table 2:** Fits of the *BeppoSAX* data using a power law plus Galactic absorption model: best fit spectral parameters.
Observation	$\Gamma$	$N_{\rm H}$	$\chi^2$ (d.o.f.), proba.
		10²⁰ cm^-2
2001	$\rm 1.87^{+0.02} _{-0.03}$	<3.15^p	182.23(139), 0.008
1997	$\rm 1.77^{+0.07} _{-0.06}$	<4.08^p	106.88(99), 0.277
2002	$\rm 1.72^{+0.07} _{-0.07}$	$\rm 3.69^{+2.75} _{-0.79}$	104.70(99), 0.328

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