Table 3: Results from the two-temperature model fits to the EPIC-pn spectra - the parameters allowed to vary with time. Fluxes are given in units of 10-13 erg cm-2 s-1 and emission measures EM in 1058 cm-3.
Parameter Rev. 626 Rev. 244 Rev. 21/22
  May 2003 Apr. 2001 Jan. 2000
Model A
NEI kT (keV) $\rm 3.22_{-0.49}^{+0.53}$ $\rm 1.76_{-0.34}^{+0.68}$ $\rm 2.10_{-0.29}^{+0.35}$
NEI EM $\rm 1.00_{-0.15}^{+0.08}$ $\rm0.69_{-0.15}^{+0.18}$ $\rm0.43_{-0.06}^{+0.06}$
RAYMOND kT (keV) $\rm0.30_{-0.02}^{+0.02}$ $\rm0.24_{-0.02}^{+0.02}$ $\rm0.24_{-0.02}^{+0.02}$
RAYMOND EM $\rm 16.0_{-3.7}^{+3.0}$ $\rm 5.1_{-1.4}^{+1.1}$ $\rm 3.2_{-0.9}^{+0.7}$
Flux (0.5-2.0 keV) 8.10 2.77 1.75
Flux (3.0-10.0 keV) 1.77 0.43 0.39
Flux (0.2-10.0 keV) 11.4 3.82 2.59

Model B
NEI kT (keV) $\rm 3.11_{-0.45}^{+0.63}$ $\rm 1.65_{-0.18}^{+0.42}$ $\rm 2.01_{-0.28}^{+0.17}$
NEI EM $\rm 1.03_{-0.14}^{+0.14}$ $\rm0.74_{-0.15}^{+0.25}$ $\rm0.45_{-0.05}^{+0.07}$
MEKAL kT (keV) $\rm0.31_{-0.02}^{+0.02}$ $\rm0.25_{-0.02}^{+0.03}$ $\rm0.24_{-0.02}^{+0.01}$
MEKAL EM $\rm 13.4_{-1.3}^{+1.4}$ $\rm 4.0_{-0.9}^{+0.9}$ $\rm 2.6_{-0.6}^{+0.6}$
Flux (0.5-2.0 keV) 8.11 2.78 1.75
Flux (3.0-10.0 keV) 1.74 0.40 0.38
Flux (0.2-10.0 keV) 11.4 3.79 2.58


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