Astronomy & Astrophysics

Table 2: Power-law fits to 4 spectra in Fig. 6. The high $\chi ^2_\nu$ value for the ``PCA high'' spectrum points to the inconsistency with a power-law model.
Parameter PCA low PCA high Swift-XRT XMM-Newton

Date 2006-08-21 2007-04-10 2006-08-11 2006-08-31

Bandpass 3-20 keV 3-20 0.3-10 0.6-10

$N_{\rm H}^\ast$ 0.51 (fixed) 0.51 (fixed) $0.459\pm0.09$ $0.577\pm0.002$

$Z_{\rm Ne}$ n/a n/a $3.3\pm0.4$ $1.89\pm0.06$

$\Gamma$ $2.27\pm0.02$ 2.48 $1.93\pm0.03$ $2.348\pm0.006$

Flux $^\ddag$ $1.37\pm0.01$ 4.85 $5.10\pm0.05$ $0.887\pm0.003$

$\chi ^2_\nu$ ( $\nu$ ) 0.8851 (37) 91.0 $^\times$ (37) 1.209 (219) 1.3451 (1891)

$^\ast$ in units of 10²² cm^-2; $^\ddag$ 2-10 keV absorbed flux, in 10^-10 erg cm^-2 s^-1; $^\times$ the reduced $\chi^2$
is so high that we refrain from quoting errors on fitted parameters.

**Table 2:** Power-law fits to 4 spectra in Fig. 6. The high $\chi ^2_\nu$ value for the ``PCA high'' spectrum points to the inconsistency with a power-law model.
Parameter	PCA low	PCA high	Swift-XRT	XMM-Newton
Date	2006-08-21	2007-04-10	2006-08-11	2006-08-31
Bandpass	3-20 keV	3-20	0.3-10	0.6-10
$N_{\rm H}^\ast$	0.51 (fixed)	0.51 (fixed)	$0.459\pm0.09$	$0.577\pm0.002$
$Z_{\rm Ne}$	n/a	n/a	$3.3\pm0.4$	$1.89\pm0.06$
$\Gamma$	$2.27\pm0.02$	2.48	$1.93\pm0.03$	$2.348\pm0.006$
Flux $^\ddag$	$1.37\pm0.01$	4.85	$5.10\pm0.05$	$0.887\pm0.003$
$\chi ^2_\nu$ ( $\nu$ )	0.8851 (37)	91.0 $^\times$ (37)	1.209 (219)	1.3451 (1891)

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