Open Access

Table A.1

Fitting parameters for optically bright and faint FGK stars.

Param. All FGK Opt-bright FGK
G<5
Opt-faint FGK
G>5
kT1 0.072 ± 0.003 0.071 ± 0.003 0.07 fixed
N1 339+11Mathematical equation: ${ 33^{+11}_{-9}}$ 5614+16Mathematical equation: ${56^{+16}_{-14}}$ 11+3Mathematical equation: ${1^{+3}_{-1}}$
kT2 0.36 ± 0.02 0.37 ± 0.02 0.20 ± 0.03
N2 3.9 ± 0.8 6 ± 1 3±1
kT3 0.80 ± 0.03 0.80 ± 0.03 0.60 ± 0.07
N3 2.4 ± 0.6 5 ± 1 2±1
Z 0.70.1+0.2Mathematical equation: ${ 0.7^{+0.2}_{-0.1} }$ 0.6 ± 0.1 0.40.2+0.4Mathematical equation: $0.4_{-0.2}^{ +0.4}$

χν2χ2d.o.f.Mathematical equation: $\chi^2_\nu \frac{\chi^2}{d.o.f.}$ 1.4432.3301Mathematical equation: ${ 1.4\frac{432.3}{301}}$ 1.3272.32207Mathematical equation: ${1.3\frac{272.32}{207}}$ 0.679.76129Mathematical equation: ${0.6\frac{79.76}{129}}$

Notes. The 3T-APEC model is used to fit in energy range 0.2-2.5 keV. Except for the all FGK spectrum, the channel is binned to have minimal 20 counts. N is in the unit 10410144π(10pc)2cm5Mathematical equation: $10^{-4}\frac{{10}^{-14}}{4\pi(10 {\rm pc})^2}~ \mathrm{cm}^{-5}$.

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