Table 4: Parameters for the models of Table 3 with lower $\chi _{\nu } ^{2}$ (second and third models) during the three pointings. The H column is given in units of $10^{22}~\rm cm^{-2}$ . Energies and temperatures are given in keV.
Model Param. XTE-1997 SAX-1998 XTE-2001

highecut(po) $N_{\rm H}$ 4.5 $\pm$ 0.4 1.1 $\pm$ 0.3 4.6 $\pm$ 0.1

$E_{{\rm cut}}$ 7.6 $\pm$ 0.4 7.8 $\pm$ 0.5 4.3 $\pm$ 0.3

$E_{{\rm fold}}$ 16.3 $\pm$ 1.2 11 $\pm$ 3 20 $\pm$ 2

$\Gamma$ 1.6 $\pm$ 0.1 1.0 $\pm$ 0.2 1.6 $\pm$ 0.1

po + bb $N_{\rm H}$ 4.4 $\pm$ 0.4 1.0 $\pm$ 0.3 4.8 $\pm$ 0.5

kT 2.16 $\pm$ 0.08 1.74 $\pm$ 0.11 2.4 $\pm$ 0.1

$\Gamma$ 1.96 $\pm$ 0.04 1.53 $\pm$ 0.14 2.0 $\pm$ 0.1

**Table 4:** Parameters for the models of Table 3 with lower $\chi _{\nu } ^{2}$ (second and third models) during the three pointings. The H column is given in units of $10^{22}~\rm cm^{-2}$ . Energies and temperatures are given in keV.
Model	Param.	XTE-1997	SAX-1998	XTE-2001
highecut(po)	$N_{\rm H}$	4.5 $\pm$ 0.4	1.1 $\pm$ 0.3	4.6 $\pm$ 0.1
	$E_{{\rm cut}}$	7.6 $\pm$ 0.4	7.8 $\pm$ 0.5	4.3 $\pm$ 0.3
	$E_{{\rm fold}}$	16.3 $\pm$ 1.2	11 $\pm$ 3	20 $\pm$ 2
	$\Gamma$	1.6 $\pm$ 0.1	1.0 $\pm$ 0.2	1.6 $\pm$ 0.1
po + bb	$N_{\rm H}$	4.4 $\pm$ 0.4	1.0 $\pm$ 0.3	4.8 $\pm$ 0.5
	kT	2.16 $\pm$ 0.08	1.74 $\pm$ 0.11	2.4 $\pm$ 0.1
	$\Gamma$	1.96 $\pm$ 0.04	1.53 $\pm$ 0.14	2.0 $\pm$ 0.1

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