\begin{table}%t2
\par
%\centering
\par
\caption{Spectral fits$^a$ to the observations of RX J0720.4-3125.\label{temp}}
   \begin{tabular}{ccccccc}
   \hline\hline
Orbit & $kT$ (eV) & $L_{\rm bb}^b$  & $\Gamma^c$ & \multicolumn{3}{c}{Flux $^d$}           \\
      &           &                 &            & (10--23 \AA) & (23--38 \AA) & (10--38 \AA) \\
\hline
0078  & 81.3(3)   & 2.54(3)         &  1.44(5)   & 1.86(4)     & 4.72(7)     & 6.58(10)    \\
0175  & 81.4(5)   & 2.42(3)         &  1.45(5)   & 1.77(5)     & 4.49(7)     & 6.26(11)    \\
0533  & 84.6(4)   & 2.22(3)         &  1.74(5)   & 1.89(4)     & 4.20(7)     & 6.09(11)    \\
0534  & 84.0(4)   & 2.28(3)         &  1.67(5)   & 1.88(4)     & 4.31(7)     & 6.19(11)    \\
0622  & 86.3(3)   & 2.07(2)         &  1.85(6)   & 1.93(4)     & 4.08(7)     & 6.01(06)    \\
0711  & 98.2(4)   & 1.96(2)         &  2.70(8)   & 2.81(4)     & 4.01(6)     & 6.82(09)    \\
\hline
   \end{tabular}
{\begin{list}{}{}
 \item[$^a$] Fit range 10--38~\AA. For the interstellar absorption
             component we use cross sections from \citet{verner96},
             and abundances from \citet{wilms00}. Numbers in
             parentheses are 1-$\sigma$ confidence limits in the last
             digit(s). For the fits with a blackbody, the best-fit
             value for $N_{\rm H}$, constrained to be the same in all
             observations, is $(4.3 \pm 0.1) \times 10^{20} ~{\rm
             cm}^{-2}$. For the fits with a blackbody times a power
             law, the best-fit values for $N_{\rm H}$, $kT$, and the
             bolometric luminosity of the blackbody, constrained to be
             the same in all observations are, respectively, $(1.28
             \pm 0.1) \times 10^{20} ~{\rm cm}^{-2}$, $70.3 \pm 0.1$
             eV,  and $(3.04 \pm 0.02) \times 10^{32} d^2_{\rm 300}$
             erg s$^{-1}$, with $d_{\rm 300}$ the distance to \rxj\ in
             units of 300~pc. For the fits with a blackbody model,
             $\chi^2 = 874.1$ for~$662$  degrees of freedom. For the
             fits with a blackbody times a power-law model $\chi^2 =
             776.8$ for $668$ degrees of freedom.
 \item[$^b$] Bolometric luminosity of the blackbody in units of
             10$^{32} d^2_{\rm 300}$~erg~s$^{-1}$, where $d_{\rm 300}$ is
	     the distance to the source in units of 300~pc.
 \item[$^c$] Index of the power law in the model that consists of a
             blackbody times a power law (see text).
 \item[$^d$] Observed flux, obtained from the fits with a blackbody
             times a power-law; only statistical errors are indicated. The systematic
             errors in the flux are of order 5--10\%.
\end{list}
}
\end{table}