\begin{table}%tb2
\caption{\label{tabb2}{\small XSPEC} best-fit parameters 
   for the two brightest supersoft sources. (An asterisk indicates 
that we could not determine an error for that fit parameter.)}
%\centering
\par
\begin{tabular}{@{}lrr}
\hline
\hline \\ 
parameter &  No.~68 & No.~96 \\  
\hline
\hline \\ 
\multicolumn{3}{c}{model: wabs$_{\rm Gal}$ $\times$ wabs $\times$ blackbody  }\\[5pt]  
\hline 
$n_{\rm H}~(\times 10^{21}$~cm$^{-2})$  & $\rm 1.4^{+1.4}_{-0.5}$  & $\rm 4.7^{+2.3}_{-1.0}$ \\[5pt] 
$T_{\rm bb}$~(keV)       & $\rm 0.065^{+0.014}_{-0.013}$ & $\rm 0.058^{+0.032}_{-0.023}$\\[5pt]
$K_{\rm bb}~(\times 10^{-6})$    & $\rm 2.3^{+0.3}_{-0.4}$ & $\rm 48^{+35}_{-25}$\\ [5pt]   
\hline 
$\chi_\nu^2$~(d.o.f.) &  1.01~(7) &  0.51~(5) \\ [5pt] 
$L_{\rm{0.3-8}}~(\times 10^{38}$~erg~s$^{-1})$ & $\rm 0.9^{+3.4}_{-0.4}$ & [$>$1]  \\[5pt]
\hline
\hline  
\multicolumn{3}{c}{model: wabs$_{\rm Gal}$ $\times$ wabs $\times$ raymond-smith  }\\[5pt]  
\hline 
$n_{\rm H}~(\times 10^{21}$~cm$^{-2})$  & $\rm 1.9^{+1.5}_{-1.2}$  & $\rm 4.5^{+150}_{-4.5}$ \\[5pt] 
$T_{\rm rs}$~(keV)       & $\rm 0.087^{+0.033}_{-0.027}$ & $\rm 0.082^{+0.007}_{-0.013}$\\[5pt]
Z (metal ab.) & $\rm 0.01^{+0.04}_{-0.01}$ & $\rm 0.02^{+0.14}_{-0.02}$  \\[5pt]
$K_{\rm rs}~(\times 10^{-3})$    & $\rm 7.7^{+8.0}_{-4.5}$ & $\rm 59^{+*}_{-*}$\\ [5pt]   
\hline 
$\chi_\nu^2$~(d.o.f.) &  1.08~(6) &  0.41~(4) \\ 
$L_{\rm{0.3-8}}~(\times 10^{38}$~erg~s$^{-1})$ & $\rm 2.0^{+10.2}_{-1.5}$ & [$>$1]  \\
\hline  
\end{tabular}  
\end{table}