Table 4: Summary of the power-law model fits to the INTEGRAL-IBIS-ISGRI total-spectra of 1708 summing observations taken in intervals of $\sim $1 year and for the total exposure.
\begin{displaymath}\begin{tabular}{l r@{ $\pm$ }l r@{ $\pm$ }l l } \hline \hline... ...times 10^{-11}$~erg~cm$^{-2}$~s$^{-1}$}\\ \hline \end{tabular}\end{displaymath}
For each spectrum are given the revolution interval over which 1708 observations
are summed, the photon index, the 20-150 keV flux and $\chi^2_{\rm r}$.

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