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Table 4:

Spectral fits and quantile properties.
Parameter Sep. 2002   Jan. 2005 Feb. 2005 Mar. 2005 Sep. 2005
Satellite Chandra   Chandra XMM-Newton XMM-Newton XMM-Newton
Spectral analysis:
Net countsa 150.9   10.8 285.5/105.4/103.2 (47.1)/190.4/108.0 (12.4)
Scaled background countsa 27.1   0.2 224.5/56.6/52.8 (698.9)/325.6/331.0 (227.6)
Exposure (ks)a 47.85   4.66 18.34/21.87/21.91 (7.83)/19.96/19.22 (13.03)
$N_{\rm H}$ (1021 cm-2) $2.7^{\rm +1.2}_{-0.9}$   $1.4^{\rm +3.6}_{-1.4}$ $4.3^{\rm +1.3}_{-1.1}$ $1.4^{\rm +0.8}_{-0.5}$  
T (MK) $25.1^{\rm +6.3}_{-4.8}$   $46^{\rm +\infty}_{-28}$ $7.7^{\rm +1.3}_{-0.8}$ $15.9^{\rm +3.9}_{-2.0}$  
EM (1053 cm-3) $1.0^{\rm +0.3}_{-0.2}$   $0.4^{\rm +0.4}_{-0.1}$ $2.9^{\rm +1.0}_{-1.0}$ $2.1^{\rm +0.2}_{-0.2}$  
$Z/Z_\odot$ :=0.17   :=0.17 $0.17^{\rm +0.20}_{-0.06}$ :=0.17  
$F_{\rm X}$ (10-14 erg cm-2 s-1) $3.4^{\rm +0.3}_{-0.3}$   $2.0^{\rm +1.5}_{-1.1}$ $2.9^{\rm +0.2}_{-0.2}$ $5.9^{\rm +0.7}_{-0.7}$ $1.2^{\rm +1.2}_{-1.0}$b
$L_{\rm X}$ (1030 erg s-1) $1.2^{\rm +0.1}_{-0.1}$   $0.5^{\rm +0.4}_{-0.3}$ $2.5^{\rm +0.2}_{-0.2}$ $2.1^{\rm +0.2}_{-0.2}$ 0.04-0.12b

Quantile analysis:
Energy range 0.2-6.0   0.2-4.0 0.2-4.0 0.2-4.0 0.2-4.0
Net countsc 150.44   10.79 286.45 196.34 9.75
Scaled background countsc 26.56   0.21 222.55 425.66 228.25
$Q_{\rm 25\%}$ $0.17 \pm 0.01$   $0.24 \pm 0.07$ $0.15 \pm 0.01$ $0.15 \pm 0.02$ $0.0 \pm 0.5$
$Q_{\rm 50\%}$ $0.22 \pm 0.01$   $0.33 \pm 0.07$ $0.20 \pm 0.01$ $0.25 \pm 0.02$ $0.3 \pm 1.5$
$Q_{\rm 75\%}$ $0.31 \pm 0.03$   $0.42 \pm 0.14$ $0.29 \pm 0.01$ $0.34 \pm 0.03$ $0.9 \pm 1.3$
$E_{\rm 50\%}$ (keV) $1.45 \pm 0.06$   $1.44 \pm 0.25$ $0.95 \pm 0.04$ $1.14 \pm 0.07$ $1.2 \pm 4.0$
$x = \log[Q_{\rm 50\%}/(1-Q_{\rm 50\%})]$ $-0.56_{-0.03}^{\rm +0.03}$   $-0.31_{-0.14}^{\rm +0.12}$ $-0.61_{-0.03}^{\rm +0.03}$ $-0.48_{-0.04}^{\rm +0.04}$ $-0.4_{-\infty}^{\rm +\infty}$
$y = 3 \times Q_{\rm 25\%}/Q_{\rm 75\%}$ $1.63_{-0.13}^{\rm +0.13}$   $1.70_{-0.61}^{\rm +0.61}$ $1.54_{-0.07}^{\rm +0.07}$ $1.33_{-0.19}^{\rm +0.19}$ $0.05_{-0.05}^{\rm +1.42}$
Txy (MK) $\approx$20   $\approx$12 $\approx$12 $\approx$20  
$N_{{\rm H},xy}$ (1021 cm-2) $\approx$3   $\approx$8 $\approx$1 $\approx$0.8  

Jan. 2006 Feb. 2006 Mar. 2006 Apr. 2006 Jul. 2006 Dec. 2007

Satellite 		Chandra Chandra XMM-Newton Chandra Chandra Chandra

Spectral analysis: 		 
Net countsa 30.5 10.5 623.4/183.8/232.4 36.4 36.3 37.9
Scaled background countsa 0.5 0.5 998.6/215.2/209.6 0.6 0.7 1.1
Exposure (ks)a 27.82 27.11 78.38/90.90/90.95 29.57 29.57 34.73
$N_{\rm H}$ (1021 cm-2) $3.1^{\rm +2.4}_{-1.9}$ $3.6^{\rm +4.3}_{-3.1}$ $4.2^{\rm +0.3}_{-1.1}$ $4.9^{\rm +5.2}_{-2.0}$ $7.3^{\rm +2.2}_{-2.4}$ $2.5^{\rm +1.6}_{-1.0}$
T (MK) $46.8^{\rm +\infty}_{-26.0}$ $8.7^{\rm +9.7}_{-3.5}$ $11.3^{\rm +3.5}_{-2.8}~/~89^{\rm +32}_{-43}$ $15.9^{\rm +8.6}_{-7.0}$ $6.5^{\rm +2.3}_{-2.1}$ $19.9^{\rm +7.4}_{-4.7}$
EM (1053 cm-3) $0.18^{\rm +0.12}_{-0.05}$ $0.10^{\rm +0.34}_{-0.10}$ $0.22^{\rm +0.12}_{-0.13}~/~0.51^{\rm +0.08}_{-0.07}$ $0.35^{\rm +0.63}_{-0.11}$ $1.0^{\rm +1.9}_{-1.0}$ $0.20^{\rm +0.08}_{-0.05}$
$Z/Z_\odot$ :=0.17 :=0.17 :=0.17 :=0.17 :=0.17 :=0.17
$F_{\rm X}$ (10-14 erg cm-2 s-1) $0.91^{\rm +0.18}_{-0.15}$ $0.13^{\rm +0.05}_{-0.04}$ $3.7^{\rm +0.2}_{-0.2}$ $0.63^{\rm +0.11}_{-0.10}$ $0.47^{\rm +0.08}_{-0.07}$ $0.58^{\rm +0.10}_{-0.09}$
$L_{\rm X}$ (1030 erg s-1) $0.27^{\rm +0.05}_{-0.05}$ $0.10^{\rm +0.03}_{-0.03}$ $1.16^{\rm +0.07}_{-0.07}$ $0.36^{\rm +0.06}_{-0.06}$ $0.9^{\rm +0.2}_{-0.1}$ $0.20^{\rm +0.03}_{-0.03}$

Quantile analysis:

Energy range 		0.2-4.0 0.2-4.0 0.3-10.0 0.2-4.0 0.2-4.0 0.2-4.0
Net countsc 30.48 10.53 626.9 36.37 36.32 37.91
Scaled background countsc 0.52 0.47 985.1 0.63 0.68 1.09
$Q_{\rm 25\%}$ $0.28 \pm 0.04$ $0.18 \pm 0.03$ $0.081 \pm 0.010$ $0.23 \pm 0.02$ $0.18 \pm 0.01$ $0.22 \pm 0.03$
$Q_{\rm 50\%}$ $0.35 \pm 0.04$ $0.24 \pm 0.09$ $0.145 \pm 0.006$ $0.31 \pm 0.03$ $0.24 \pm 0.04$ $0.28 \pm 0.02$
$Q_{\rm 75\%}$ $0.48 \pm 0.08$ $0.46 \pm 0.19$ $0.255 \pm 0.019$ $0.40 \pm 0.06$ $0.34 \pm 0.03$ $0.40 \pm 0.06$
$E_{\rm 50\%}$ (keV) $1.52 \pm 0.15$ $1.12 \pm 0.35$ $1.709 \pm 0.06$ $1.39 \pm 0.09$ $1.11 \pm 0.14$ $1.28 \pm 0.09$
$x = \log[Q_{\rm 50\%}/(1-Q_{\rm 50\%})]$ $-0.27_{-0.08}^{\rm +0.07}$ $-0.50_{-0.26}^{\rm +0.20}$ $-0.77_{-0.02}^{\rm +0.02}$ $-0.34_{-0.05}^{\rm +0.05}$ $-0.50_{-0.09}^{\rm +0.08}$ $-0.40_{-0.05}^{\rm +0.05}$
$y = 3 \times Q_{\rm 25\%}/Q_{\rm 75\%}$ $1.74_{-0.29}^{\rm +0.29}$ $1.19_{-0.42}^{\rm +0.42}$ $0.95_{-0.11}^{\rm +0.11}$ $1.68_{-0.22}^{\rm +0.22}$ $1.65_{-0.15}^{\rm +0.15}$ $1.63_{-0.25}^{\rm +0.25}$
Txy (MK) $\approx$13 $\approx$35 $\approx$90 $\approx$10 $\approx$15 $\approx$16
$N_{{\rm H},xy}$ (1021 cm-2) $\approx$10 $\approx$0.2 $\approx$2.5 $\approx$9.0 $\approx$1.5 $\approx$3.5

Notes. The uncertainties are based on 68% Bayesian confidence ranges. X-ray luminosity and absorbed X-ray flux in the 0.1-10 keV range, assuming d=400 pc.
(a) For XMM-Newton observations, values refer to the EPIC pn, MOS1, and MOS2, respectively (pn only for September 2005). The values in parentheses refer to detectors not used in the spectral fits; (b) estimates based on models for February 2005 and March 2006; (c) based on pn data in general, except for March 2005 for which MOS1 data only were used (similar values and results were obtained for MOS2 data).


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