\begin{table}%t3
\caption{\label{table:joint_spe}Summary of best fit parameters obtained when 
joining {\it RXTE}/PCA data together with the GCDE {\it INTEGRAL}/ISGRI average spectrum,
and {\it INTEGRAL}/ISGRI and {\it INTEGRAL}/JEM-X from revolutions 53, 485, and 537.}
\par
%\centering
\par
\begin{tabular}{ccccccc}
\hline\hline
Joint   &  $N_{\rm H}$& Cross-Calibration & $\Gamma$ &  $E_{\rm cut}$ &  $E_{\rm fold}$  &  $\chi^2_{\rm red}$/d.o.f.   \\
Spectra &  $\times$10$^{22}$ cm$^{-1}$ & Constant  &  & (keV) & (keV)            & \\
\hline
PCA+ISGRI$_{\rm AV}$        & 4.2 & $0.59\pm0.03$  & $1.24\pm0.04$  & $6.2\pm0.5$  & $18\pm1$ & 1.0/79   \\
\hline
Rev. 053, JEM-X+ISGRI   & 4.2 & $0.80\pm0.10$  &   $1.80\pm0.11$   &  $<$11 & $\rm 29^{+6}_{-5}$  &  1.00/56 \\
Rev. 485, JEM-X+ISGRI   & 4.2 & $1.8\pm0.3$    &   $1.7\pm0.2$     &  $<$11 & $\rm 22^{+6}_{-4}$  &  1.03/42     \\
Rev. 537, JEM-X+ISGRI   & 4.2 & $1.3\pm0.2$    &   $1.56\pm0.11$    &  $<$11& $\rm 28^{+6}_{-5}$ &  1.10/56 \\
\hline
\end{tabular}
\end{table}