Table 5: Parameters for the comptonization models.
Model Parameter XTE 1997 SAX 1998 XTE 2001
compTT + bb $N_{\rm H}(10^{22}~\rm cm^{-2})$ 2.04 $\pm$ 0.12 0.30 $\pm$ 0.15 4.22 $\pm$ 0.16
  $T_{\rm bb}$ 0.76 $\pm$ 0.04 0.73 $\pm$ 0.05 0.65 $\pm$ 0.04
  kT0 1.50 $\pm$ 0.06 1.26 $\pm$ 0.07 1.46 $\pm$ 0.06
  kT$_{\rm e}$ 47.79 $\pm$ 0.06 47.48 $\pm$ 0.06 46.46 $\pm$ 0.06
  $\tau_{\rm p}$ 0.50 $\pm$ 0.3 0.70 $\pm$ 0.3 0.46 $\pm$ 0.3
  $F_{\rm 2-10~keV}^{(a)}$ 26.8 4.1 12.6
  $F_{{\rm bol}}^{(c)}$ 67.0 5.4 16.5
  CR(b) 0.28 0.43 0.34
  $\chi^{2}_{\nu}$(d.o.f.) 0.66 (49) 1.16 (114) 0.62 (47)
BMC $N_{\rm H}(10^{22}~\rm cm^{-2})$ 0.2 $\pm$ 0.1 0.30 $\pm$ 0.15 0.2 $\pm$ 0.1
  kT $_{{\rm col}}$ (keV) 1.38 $\pm$ 0.09 1.09 $\pm$ 0.08 1.38 $\pm$ 0.09
  $\alpha $ 1.4 $\pm$ 0.23 0.99 $\pm$ 0.18 1.26 $\pm$ 0.15
  f $\gg$1 $\gg$1 $\gg$1
  $A_{\rm N}(\times 10^{-4})$ 35.3 $\pm$ 0.3 5.5 $\pm$ 0.2 15.7 $\pm$ 0.2
  $F_{\rm 2-10~keV}^{(a)}$ 24.5 4.1 9.9
  CR(b) 0.40 0.72 0.47
  $\chi^{2}_{\nu}$(d.o.f.) 0.71 (51) 1.14 (116) 0.88 (49)
(a) Unabsorbed flux in units of 10-11 erg s-1 cm-2.
(b) Computed as $F_{20-60~\rm ke\kern -0.09em V}$/ $F_{3-20~\rm ke\kern -0.09em V}$.
(c) Unabsorbed flux in units of 10-11 erg s-1 cm-2. The spectral range is 2-100 keV
for RXTE data and 0.5-100 keV for BeppoSAX data.

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