**Table 2:** Multi-temperature fitting to the quiescent and flaring state of AT Mic; 1 $\sigma$ uncertainties are given in the last digits in parentheses.
PARAMETER	QUIESCENT^a		FLARING
	data^b	model^b	data	model
log $N_{\rm H}$ [cm^-2]	18.3^c	18.3^c	18.3^c	18.3^c
T₁ [MK]	3.16(.10)	2.94(.10)	2.91(.17)	2.71(.20)
T₂ [MK]	7.77(.13)	7.54(.14)	8.57(.34)	7.80(.27)
T₃ [MK]	23.0(1.0)	27.9(2.3)	33.9(3.2)	32.8(5.1)
EM₁ [10⁵¹ cm^-3]	2.34(.16)	3.86(.41)	2.71(.31)	4.95(1.3)
EM₂ [10⁵¹ cm^-3]	4.85(.26)	8.58(.93)	4.27(.42)	10.9(4.0)
EM₃ [10⁵¹ cm^-3]	4.99(.20)	5.51(.44)	12.47(.61)	16.5(1.9)
$EM_{\rm total}$ [10⁵¹ cm^-3]	12.2(.5)	17.8(1.1)	19.5(.8)	32.4(4.6)
$n_{\rm e}$ (O) [10¹⁰ cm^-3]^d	1.9(1.5)	1.4(1.4)	4(-3,+5)	3(-3,+4)
$L_{\rm x}$ [10²⁹ erg/s]^e	2.05(.08)	2.26(.14)	3.54(.15)	3.98(.57)
Mg/O 7.65 eV	0.51(.06)	0.44(.09)	1.00(.22)	0.68(.28)
Fe/O 7.87 eV	0.34(.02)	0.31(.05)	0.56(.04)	0.45(.16)
Si/O 8.15 eV	0.60(.06)	0.69(.11)	0.72(.22)	0.68(28)
C/O 11.26 eV	1.00(.10)	1.01(.19)	0.83(.21)	0.84(.30)
O/O 13.62 eV	1.00(.05)	1.00(.14)	1.00(.10)	1.00(.25)
N/O 14.53 eV	0.86(.09)	0.73(.16)	0.58(.27)	0.51(.31)
Ne/O 21.56 eV	1.52(.08)	1.48(.20)	1.90(.21)	1.50(.49)
O/H 13.62 eV	1.57(.05)	0.96(.09)	1.43(.10)	0.71(.13)
$EM_{\rm total}$ $~\times$ O/H	19.2(1.0)	17.1(2.0)	27.9(2.3)	23.0(5.3)
$\chi^2$ /d.o.f.	1.1	1.4	0.60	1.10

^a Based on good time interval (with low solar proton flux) and excluding the stellar flare (see Fig. 5).
^b Data stands for "fit weight data" and model stands for "fit weight model".
^c Fixed at literature value from Monsignori Fossi et al. (1995).
^d Based on O VII lines only.
^e In the 0.3-10 keV energy interval.

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