Table 2: Spectral fits.

Interval		 $N_{\rm H}$ @ z Power law Mean flux
(s, rest frame) (1021 cm-2) $\Gamma$ (0.5-10 keV)

59-77		 $\rm 2.3^{+2.0}_{-1.2}$ $\rm 1.41^{+0.09}_{-0.09}$ $9.3\times 10^{-9}$
77-99 $\rm 4.0^{+2.0}_{-1.3}$ $\rm 1.84^{+0.11}_{-0.10}$ $6.0\times 10^{-9}$
99-130 $\rm 2.3^{+1.8}_{-1.1}$ $\rm 1.91^{+0.11}_{-0.10}$ $4.7\times 10^{-9}$
130-268 $\rm 1.9^{+1.5}_{-0.8}$ $\rm 2.34^{+0.10}_{-0.09}$ $8.1\times 10^{-10}$
268-89232 ${<}0.9^\char93 $ $\rm 1.98^{+0.16}_{-0.20}$ $1.4\times 10^{-12}$

268-506*		 <0.7+ $\rm 3.30^{+0.41}_{-0.36}$ $2.3\times 10^{-11}$
507-38647   1.76+0.16-0.17 $1.9\times 10^{-12}$
41152-70835   1.72+0.21-0.21 $2.1\times 10^{-12}$
73793-89232   1.78+0.70-0.68 $6.6\times 10^{-13}$
$^\char93 $ The $3\sigma $ ( $\Delta\chi=6.43$) upper limit is $2.0\times10^{21}\rm\ cm^{-2}$. + Value fixed for all the four PC observations. The $3\sigma $ upper limit is $1.2\times10^{21}\rm\ cm^{-2}$. * Adding a cut-off to the power law, the photon index is constrained to be 3.03+0.80-2.11 and the high energy cut-off >0.5 keV.


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