Table 2: Best-fit parameters for the spectral models listed at the end of Sect. 2. $\chi ^2/$d.o.f. values are given in correspondence of each model's name and for each observation.
  Chandra, 10/09/02 XMM-Newton, 08/03/03 XMM-Newton, 27/03/03
actual duration [s] 10 608 $\sim$10 650 (MOS), 10 510 (pn) $\sim$10 665 (MOS), 10 510 (pn)
count rate [s-1] $0.094 \pm 0.003$ $0.919 \pm 0.012$ (pn) $0.878 \pm 0.012$ (pn)
model I 61.7/44 = 1.40 465.7/478 = 0.97 510.0/460 = 1.11
$N_{\rm H}$ [1022 cm-2] $\rm0.56^{+0.35}_{-0.19}$ $\rm0.72^{+0.03}_{-0.05}$ $\rm0.69^{+0.05}_{-0.03}$
$\Gamma $ $\rm 1.15^{+0.23}_{-0.21}$ $\rm 1.56^{+0.02}_{-0.05}$ $\rm 1.49^{+0.05}_{-0.04}$
model IIa (narrow line) 61.7/43 = 1.43 465.4/477 = 0.98 510.8/459 =1.11
$N_{\rm H}$ [1022 cm-2] $\rm0.58^{+0.35}_{-0.29}$ $\rm0.69^{+0.05}_{-0.02}$ $\rm0.70^{+0.05}_{-0.03}$
$\Gamma $ $\rm 1.17^{+0.23}_{-0.22}$ $\rm 1.53^{+0.04}_{-0.04}$ $\rm 1.50^{+0.03}_{-0.05}$
E0(Fe K$\alpha$) [keV] 6.4 (fixed) 6.4 (fixed) 6.4 (fixed)
EW(Fe K$\alpha$) [eV] $\rm 5^{+288}_{-5}$ $0 ({\ll}1)$ 0 (<87)
$\sigma$(Fe K$\alpha$) [eV] 20 (fixed) 20 (fixed) 20 (fixed)
model IIb (broad line) 61.5/43 = 1.43 465.5/477 = 0.98 510.8/459 =1.11
$N_{\rm H}$ [1022 cm-2] $\rm0.60^{+0.40}_{-0.32}$ $\rm0.69^{+0.05}_{-0.02}$ $\rm0.70^{+0.05}_{-0.04}$
$\Gamma $ $\rm 1.20^{+0.27}_{-0.26}$ $\rm 1.53^{+0.04}_{-0.04}$ $\rm 1.50^{+0.04}_{-0.04}$
E0(Fe K$\alpha$) [keV] 6.4 (fixed) 6.4 (fixed) 6.4 (fixed)
EW(Fe K$\alpha$) [eV] $\rm 165^{+564}_{-165}$ 0 (<137) 0 (<187)
$\sigma$(Fe K$\alpha$) [eV] 390 (fixed) 390 (fixed) 390 (fixed)
model IIIa (narrow line) 56.9/42 = 1.35 566.0/477 = 1.19 539.4/459 = 1.18
$N_{\rm H}$ [1022 cm-2] $\rm0.28^{+0.16}_{-0.14}$ $\rm0.44^{+0.03}_{-0.02}$ $\rm0.45^{+0.04}_{-0.02}$
T (blackbody) [keV] $\rm 3.85^{+0.77}_{-0.67}$ $\rm 2.34^{+0.08}_{-0.09}$ $\rm 2.29^{+0.09}_{-0.09}$
E0(Fe K$\alpha$) [keV] $\rm 7.04^{+0.20}_{-1.67}$ 6.4 (fixed) 6.4 (fixed)
EW(Fe K$\alpha$) $331^{+E\rm 13}_{-331}$ 0 (<82) 0 (<97)
$\sigma$(Fe K$\alpha$) [eV] 20 (fixed) 20 (fixed) 20 (fixed)
model IIIb (broad line) 58.4/42 = 1.39 566.0/477 = 1.19 537.0/459 = 1.17
$N_{\rm H}$ [1022 cm-2] $\rm0.32^{+0.16}_{-0.14}$ $\rm0.44^{+0.03}_{-0.02}$ $\rm0.48^{+0.02}_{-0.08}$
T (blackbody) [keV] $\rm 3.39^{+0.89}_{-0.55}$ $\rm 2.34^{+0.08}_{-0.09}$ $\rm 2.18^{+0.09}_{-0.10}$
E0(Fe K$\alpha$) [keV] $\rm 7.09^{+1.01}_{-0.53}$ 6.4 (fixed) 6.4 (fixed)
EW(Fe K$\alpha$) $699^{+E\rm 13}_{-699}$ 0 (<149) 0 (<472)
$\sigma$(Fe K$\alpha$) [eV] 390 (fixed) 390 (fixed) 390 (fixed)
model IV - 460.2/476 = 0.97 503.5/458 = 1.10
$N_{\rm H}$ [1022 cm-2] - $\rm0.67^{+0.04}_{-0.08}$ $\rm0.66^{+0.10}_{-0.05}$
$\Gamma $ - $\rm 1.53^{+0.04}_{-0.04}$ $\rm 1.52^{+0.15}_{-0.06}$
T (blackbody) [keV] - $\rm0.95^{+0.13}_{-0.19}$ $\rm 1.14^{+0.09}_{-0.16}$
r (blackbody) [km] - 0 (<0.07) 0 (<0.05)


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