Table 6: Results of the $\chi ^2$ fits to our source count distributions with a model with three power-laws.
Energy band ${\rm\Gamma_b}$ ${\rm\Gamma_i}$ ${\rm\Gamma_f}$ $S_{\rm b}^{\rm b}$ $S_{\rm b}^{\rm f}$ K F-test
(keV)       ( ${\rm 10^{-14}~cgs}$) ( ${\rm 10^{-14}~cgs}$) ( ${\rm deg^2}$) prob. (%)
(1) (2) (3) (4) (5) (6) (7) (8)
0.5-1 $\rm 2.34_{-0.02}^{+0.02}$ $\rm 1.91_{-0.03}^{+0.02}$ $\rm 1.56_{-0.06}^{+0.06}$ $\rm0.97_{-0.07}^{+0.06}$ $\rm0.31_{-0.02}^{+0.04}$ $\rm 57.6_{-3.7}^{+4.9}$ $\>$99.99
1-2 $\rm 2.51_{-0.02}^{+0.02}$ $\rm 2.28_{-0.04}^{+0.04}$ $\rm 1.74_{-0.03}^{+0.03}$ $\rm 1.21_{-0.20}^{+0.15}$ $\rm0.52_{-0.01}^{+0.04}$ $\rm 47.9_{-7.6}^{+12.4}$ $\>$99.99
2-4.5 $\rm 2.72_{-0.03}^{+0.03}$ $\rm 2.39_{-0.03}^{+0.04}$ $\rm 1.93_{-0.22}^{+0.13}$ $\rm 2.2_{-0.16}^{+0.19}$ $\rm0.72_{-0.08}^{+0.06}$ $4\rm0.4_{-5.9}^{+5.9}$ $\>$97.3
4.5-10 $\rm 2.72_{-0.03}^{+0.03}$ - - - - $\rm 270.7_{-16.2}^{+17.2}$  
0.5-2 $\rm 2.44_{-0.02}^{+0.03}$ $\rm 2.10_{-0.04}^{+0.03}$ $\rm 1.61_{-0.02}^{+0.03}$ $\rm 2.42_{-0.22}^{+0.19}$ $\rm0.80_{-0.06}^{+0.04}$ $\rm 46.0_{-4.0}^{+6.1}$ $\>$99.99
2-10 $\rm 2.69_{-0.03}^{+0.02}$ $\rm 2.40_{-0.04}^{+0.01}$ $\rm0.96_{-0.51}^{+0.40}$ $\rm 4.09_{-0.69}^{+0.22}$ $\rm 1.24_{-0.13}^{+0.04}$ $\rm 60.2_{-3.4}^{+6.9}$ $\>$94.3
(1) Energy band definition (in keV). (2), (3) and (4) Power-law slopes at the brightest, intermediate and fainter fluxes respectively. (5) and (6) Flux breaks (in units of ${\rm 10^{-14}~erg~cm^{-2}~s^{-1}}$) at bright and faint fluxes. (7) Normalisation of the model in each band. (8) F-test significance of improvement of the quality of the fit with respect to a broken power-law model. Errors are 1$\sigma $ uncertainty.


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