Table 2: Best-fit spectral parameters for the synthetic spectra of HD 81809 derived assuming a different coverage of AR, CO, and flaring regions.
Phase Surface filling factor kT₁ kT₂ EM₁ EM₂ $\overline{\chi_{\rm r}}^2$ $L_{\rm X}$ (0.2-2.5 keV) kT

AR CO FL [keV] [keV] [10⁵⁰ cm^-3] [10⁵⁰ cm^-3] [erg s^-1] [keV]

Max 60% 40% - $0.24\pm 0.03$ $0.51\pm 0.02$ $2.0\pm 0.4$ $3.0\pm 0.4$ 0.65 $5.35\times 10^{28}$ 0.40

Min 60% 4% - $0.16\pm 0.01$ $0.42\pm 0.03$ $0.51\pm 0.07$ $0.53\pm 0.08$ 0.70 $9.70\times 10^{27}$ 0.29

Max + Flare 60% 40% 0.0007 $0.33\pm 0.01$ $1.26\pm 0.02$ $5.8\pm 0.1$ $8.1\pm 0.2$ 0.95 $1.1\times 10^{29}$ 0.88

**Table 2:** Best-fit spectral parameters for the synthetic spectra of HD 81809 derived assuming a different coverage of AR, CO, and flaring regions.
Phase	Surface filling factor	kT₁	kT₂	EM₁	EM₂	$\overline{\chi_{\rm r}}^2$	$L_{\rm X}$ (0.2-2.5 keV)	kT
	AR	CO	FL	[keV]	[keV]	[10⁵⁰ cm^-3]	[10⁵⁰ cm^-3]		[erg s^-1]	[keV]
Max	60%	40%	-	$0.24\pm 0.03$	$0.51\pm 0.02$	$2.0\pm 0.4$	$3.0\pm 0.4$	0.65	$5.35\times 10^{28}$	0.40
Min	60%	4%	-	$0.16\pm 0.01$	$0.42\pm 0.03$	$0.51\pm 0.07$	$0.53\pm 0.08$	0.70	$9.70\times 10^{27}$	0.29
Max + Flare	60%	40%	0.0007	$0.33\pm 0.01$	$1.26\pm 0.02$	$5.8\pm 0.1$	$8.1\pm 0.2$	0.95	$1.1\times 10^{29}$	0.88

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