**Table 3:** Estimates of the equivalent hydrogen column density $N_{\rm H}$ , from combined LECS (0.1-4 keV) and MECS (1.6-10 keV) observations with various absorption models and chemical abundances.
Model	$N_{\rm H}(^*)$	$\Gamma$	F_O	F_Fe	$\chi^2_r$
`aneb+wabs`	3.54 $\pm$ 0.01	2.124 $\pm$ 0.001	-	-	0.89
`angr+bcmc`	3.33 $\pm$ 0.01	2.124 $\pm$ 0.001	-	-	0.99
`angr+bcmc`	3.62 $\pm$ 0.04	2.125 $\pm$ 0.001	0.81 $\pm$ 0.02	-	0.90
`angr+bcmc`	3.63 $\pm$ 0.04	2.124 $\pm$ 0.001	0.83 $\pm$ 0.03	0.87 $\pm$ 0.05	0.88
`angr+bcmc`	3.42 $\pm$ 0.02	2.123 $\pm$ 0.001	-	0.74 $\pm$ 0.04	0.93

$\textstyle \parbox{11cm}{ $(^*)$\space In units of 10$^{21}$\space cm$^{-2}$ .}$

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