Table 2: Best-fit values for the black-body and power-law normalizations, when the four spectra are fitted simultaneously with common values of $N_{\rm H}$ ( $(5.8\pm 0.1)\times 10^{21}$ cm-2), $\Gamma $ ( $1.60\pm 0.02$) and $kT_{\rm BB}$ ( 1.36+0.04-0.03 keV). Errors are at a 90% confidence level for a single interesting parameter.
Spectral Phase Interval
Parameter A B C D
$R_{\rm BB}^{a}$ $76\pm3$ $130\pm2$ $121\pm2$ $87\pm2$
$I_{\rm PL}^{b}$ $\rm 2.24^{+0.07}_{-0.03}$ $\rm 3.25^{+0.05}_{-0.03}$ $\rm 1.32^{+0.03}_{-0.06}$ $\rm0.89^{+0.01}_{-0.03}$
$f_{\rm TOT}^{c}$ 2.04 3.42 1.77 1.06
$f_{\rm PL}^{c}$ 1.69 2.46 1.00 0.67
  (83%) (72%) (56%) (63%)
$f_{\rm BB}^{c}$ 0.35 0.96 0.77 0.39
  (17%) (28%) (44%) (37%)
a Radius of the blackbody component (in metres) for a source distance of 2.5 kpc.
b Intensity of the power-law component in units of 10-3 ph cm-2 s-1 keV-1 at 1 keV.
c Unabsorbed flux in the energy range 0.3-10 keV, in units of 10-11 erg cm-2 s-1.

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