Table 4: Soft excess: fits of the LECS, MECS, PDS data and comparison with XMM-Newton data. A stands for photoelectric absorption, PEXRAV for the Compton reflection from cold material, G for a Gaussian line and BB for a black body. We first consider the spectra above 2 keV, freezing all the parameters of the continuum ($\Gamma $, R, $E_{\rm c}$) to their best fit value of Table 3. We then add the data below 2 keV, add a soft excess component, and fit again the broad-band spectrum.
Obs. Model $N_{\rm H}$ $kT_{\rm {BB}}$ $\chi^2$(d.o.f.) Proba.
    1020 cm-2 eV    
BeppoSAX 2001 A+PEXRAV+G+BB $\rm 3.60^{+0.50} _{-0.31}$ $\rm 100.00^{+\it u} _{-99.90}$ 137.40(140) 0.546
XMM 2000 A+PEXRAV+G+BB <3.14p $\rm 164.86^{+4.85} _{-8.57}$ 325.09(231) <0.001
$\textstyle \parbox{14cm}{ $^u$\space Unbounded parameters.\\ $^p$\space Pegged at Galactic value $N_{\rm H}=2.90\times10^{20}$ ~cm$^{-2}$ . }$


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