\begin{table}%t7
\par
\caption {\label{tab:fit}X-ray fit results.}
%\centerline
 {\begin{tabular}{ccccccc}
\hline\hline
Inst. & Obs. epoch & Fit model & $N_{\rm H}$ & $\Gamma$ & Norm & Flux$^{a}$\\
(1) & (2) & (3) & (4) & (5) & (6) & (7)\\
\hline
XRT & 2006-10-27 & abs pl & $\rm 0.08^{0.26}_{0.00}$ & $\rm 1.3^{1.7}_{0.9}$ & $\rm 3.9^{6.2}_{2.6}$ & $\rm 2.4^{2.8}_{2.0}$\\
XRT & 2006-10-30 & abs pl & $\rm 0.15^{0.20}_{0.06}$ & $\rm 1.7^{2.2}_{1.4}$ & $\rm 6.9^{9.6}_{5.0}$ & $\rm 2.6^{3.0}_{2.0}$\\
XRT & 2006-10-31 & abs pl & $\rm 0.10^{0.22}_{0.01}$ & $\rm 1.5^{1.8}_{1.2}$ & $\rm 5.1^{7.3}_{3.6}$ & $\rm 2.4^{2.8}_{1.9}$\\
XRT & 2008-02-10 & abs pl & $\rm 0.05^{0.12}_{0.00}$ & $\rm 1.3^{1.5}_{1.1}$ & $\rm 4.2^{5.4}_{3.3}$ & $\rm 2.6^{2.8}_{2.1}$\\
XRT & 2008-02-12 & abs pl & $\rm 0.06^{0.18}_{0.00}$ & $\rm 1.3^{1.5}_{1.0}$ & $\rm 3.6^{5.1}_{2.7}$ & $\rm 2.3^{2.7}_{2.0}$\\
RXTE & 2006-11-01 & pl & -- & $\rm 1.3^{1.7}_{1.0}$ & $\rm 5.7^{1.3}_{0.0}$ & $\rm 6.3^{7.2}_{4.6}$\\
BAT & 2006--2008 & pl & -- & $\rm 1.5^{1.9}_{1.0}$ & $\rm 14^{71}_{0.0}$ & $\rm 0.27^{0.34}_{0.21}$\\
joint & -- & abs pl & $\rm 0.05^{0.08}_{0.02}$ & $\rm 1.3^{1.4}_{1.2}$ & $\rm 4.2^{4.6}_{3.8}$ & -- \\
\hline
\end{tabular}}
\par
\smallskip
Explanation of columns: (1)~=~instruments; (2)~=~observation date; (3)~=~fit model; (4)~=~column density (units of 10$^{22}$~cm$^{-2}$), (5)~=~spectral index; (6)~=~normalization (units of 10$^{-4}$~ph~keV$^{-1}$~cm$^{-2}$); (7)~=~flux units are 10$^{-12}$~erg~cm$^{-2}$~s$^{-1}$ for all instruments.
\\
$^{a}$ Fluxes are computed in the following energy ranges for the different instruments: XRT 0.6--6.0~keV, RXTE  3--20~keV, BAT 15--150~keV, joint 0.6--150~keV.
\end{table}