\begin{table}%t1
\caption{\label{tab:par}Best-fit spectral parameters for the 10 \xmm\ observations of \hd\ discussed here, spanning 4.5 years.} 
%\centering
\par
\begin{tabular}{ccccc}
\hline\hline
Date & pn rate & \lx\ (0.2--2.5 keV) & \lx\ (0.73--3.5 keV) & $kT$ \\
        & cts s$^{-1}$ & erg s$^{-1}$ & erg s$^{-1}$ & keV \\ \hline
2001-04-25 & $0.1830 \pm 0.055$ & $3.85 \times 10^{28}$ & $1.46 \times 10^{28}$& 0.34 \\
2001-11-01 & $0.3418 \pm 0.024$ & $6.42 \times 10^{28}$ & $2.91 \times 10^{28}$& 0.40 \\
2002-06-06 & $0.7456 \pm 0.037$ & $1.78 \times 10^{29}$ & $8.88 \times 10^{29}$& 0.81 \\
2002-11-02 & $0.2455 \pm 0.024$ & $5.31 \times 10^{28}$ & $2.31 \times 10^{28}$& 0.39 \\
2003-05-03 & $0.1522 \pm 0.017$ & $3.37 \times 10^{28}$ & $1.36 \times 10^{28}$& 0.36 \\
2003-11-22 & $0.0744 \pm 0.012$ & $2.05 \times 10^{28}$ & $7.33 \times 10^{27}$& 0.33 \\
2004-04-30 & $0.0452 \pm 0.002$ & $1.32 \times 10^{28}$ & $4.59 \times 10^{27}$& 0.31 \\
2004-11-09 & $0.0816 \pm 0.003$ & $1.67 \times 10^{28}$ & $6.57 \times 10^{27}$& 0.33 \\
2005-05-03 & $0.0574 \pm 0.002$ & $1.41 \times 10^{28}$ & $4.65 \times 10^{27}$& 0.32 \\
2005-10-30 & $0.0753 \pm 0.002$ & $1.81 \times 10^{28}$& $7.56 \times 10^{27}$& 0.32 \\
2006-11-06 & $0.1993 \pm 0.004$ & $4.28 \times 10^{28}$& $1.71 \times 10^{28}$& 0.36 \\
2007-05-04 & $0.2220 \pm 0.005$ & $5.48 \times 10^{28}$& $2.24 \times 10^{28}$& 0.38\\
\hline
\end{tabular}
\end{table}