Table 4: Fitted model parameters for the EPIC-pn spectrum of HD 159176 for two different background estimation techniques. The adopted model is wabs $_{\rm ISM}$ *wabs $_{\rm WIND}$ *(mekal + mekal + power). The column densities given in the table refer to the circumstellar material. The interstellar column density is frozen at $0.17\times 10^{22}$ cm^-2. The error bars represent the 1 $\sigma$ confidence interval.
$N_{\rm H}$ kT¹ Norm¹ kT² Norm² $\Gamma$ Norm³ $\chi^2_\nu$

(10²² cm^-2) (keV) (keV) d.o.f.

Annulus 0.20 0.20 $4.39\times 10$ ^-3 0.58 $1.79\times 10$ ^-3 3.50 $7.35\times 10$ ^-4 1.11

$\pm$ 0.02 $\pm$ 0.01 $\pm$ $1.05\times 10$ ^-3 $\pm$ 0.01 $\pm$ $0.19\times 10$ ^-3 $\pm$ 0.12 $\pm$ $1.25\times 10$ ^-4 319

Boxes 0.18 0.21 $3.66\times 10$ ^-3 0.59 $1.72\times 10$ ^-3 3.43 $8.12\times 10$ ^-4 1.09

$\pm$ 0.01 $\pm$ 0.01 $\pm$ $0.83\times 10$ ^-3 $\pm$ 0.01 $\pm$ $0.18\times10$ ^-3 $\pm$ 0.10 $\pm$ $1.13\times 10$ ^-4 319

**Table 4:** Fitted model parameters for the EPIC-pn spectrum of HD 159176 for two different background estimation techniques. The adopted model is `wabs` $_{\rm ISM}$ `*wabs` $_{\rm WIND}$ `*(mekal + mekal + power)`. The column densities given in the table refer to the circumstellar material. The interstellar column density is frozen at $0.17\times 10^{22}$ cm^-2. The error bars represent the 1 $\sigma$ confidence interval.
	$N_{\rm H}$	kT¹	Norm¹	kT²	Norm²	$\Gamma$	Norm³	$\chi^2_\nu$
	(10²² cm^-2)	(keV)		(keV)				d.o.f.
Annulus	0.20	0.20	$4.39\times 10$ ^-3	0.58	$1.79\times 10$ ^-3	3.50	$7.35\times 10$ ^-4	1.11
	$\pm$ 0.02	$\pm$ 0.01	$\pm$ $1.05\times 10$ ^-3	$\pm$ 0.01	$\pm$ $0.19\times 10$ ^-3	$\pm$ 0.12	$\pm$ $1.25\times 10$ ^-4	319
Boxes	0.18	0.21	$3.66\times 10$ ^-3	0.59	$1.72\times 10$ ^-3	3.43	$8.12\times 10$ ^-4	1.09
	$\pm$ 0.01	$\pm$ 0.01	$\pm$ $0.83\times 10$ ^-3	$\pm$ 0.01	$\pm$ $0.18\times10$ ^-3	$\pm$ 0.10	$\pm$ $1.13\times 10$ ^-4	319

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