Astronomy & Astrophysics

**Table 4:** Best fit parameters of the time-dependent spectroscopy with their errors at the 90% confidence levels ( $\Delta \chi ^2$ =2.71; corresponding to $\sigma =1.64$ for Gaussian statistics). $\eta \equiv \log{(L_{\rm X,intr}/L_{\rm bol})}$ .
$\begin{displaymath}\begin{tabular}{@{}crccccrrrrcc@{}} \hline \hline \noalign{\s... ...1.8 32.0 & --1.7 \\ \noalign{\smallskip } \hline \end{tabular}\end{displaymath}$