\begin{table}%t3
\caption{Goodness of fit for additive models during the three
  observations. The \rchisq\ is shown as well as the degrees of freedom
  (in parentheses). The name of the models are written in
  \textsc{xspec} terminology. All models include photoelectric absorption.}
\label{powermodels}
%\centering
\par
\begin{tabular}{lrrr}
\hline
\hline 
Model & XTE-1997  & SAX-1998  & XTE-2001 \\
\hline
po                 & 17(54) & 2.11(115) & 8.45(51)\\
highecut(po)       & 0.71(52)  & 1.32(113) & 1.27(49)\\
\hline
po + bb            & 0.94(52)  & 1.24(117) & 0.96(49)\\
po + diskbb        & 0.98(52)  & 1.26(117) & 1.31(49)\\
\hline
bremss             & 3.05(54) & 1.52(115) & 2.59(51)\\
raymond            & 17.83(54) & 1.87(115) & 10.65(51)\\
\hline 
\end{tabular}
\end{table}