\begin{table}%t2
%\centering
\par
{\caption{\label{t:rgs_bothfit}RGS fitting results for the oxygen region in Cyg~X-2.
 The parameters for the continuum emission are taken from the broad-band spectrum. The energies are measured in keV and
the Equivalent Width ({\it EW}) in eV.  
Model~1 fits the O vicinity with 3 edges
(two of which are from atomic O) and 2 absorption lines (one from atomic neutral O and the other from molecular O). 
Model~2 interprets the spectrum in terms of absorption by atomic O, either neutral or mildly ionized. Errors are given at 90\% confidence for one interesting parameter.} 
\begin{tabular}{lcc}     
\hline 
\hline
& model~1 & model~2  \\ 
\hline
{\bf Lines} & 	&\\
$E_1$ 	&   $0.524\pm0.003$      &   $0.524\pm0.003$		\\
${\it EW}_1$		&   1.45$^{+0.22}_{-0.14}$        &   $1.49\pm0.17$ 		\\
$E_2$ 	&   $0.530\pm0.001$      &   $0.530\pm0.001$		\\
${\it EW}_2$ 		&   $1.41\pm0.26$        &   $1.44\pm0.28$		\\
$E_3$ 	&   $\cdots$	         &   $0.538\pm0.001$		\\
${\it EW}_3$		&   $\cdots$	         &   $0.44^{+0.19}_{-0.24}$	\\
$E_4$ 	&   $\cdots$	         &   $0.541\pm0.001$		\\
${\it EW}_4$ 		&   $\cdots$	         &   1.01$^{+0.15}_{-0.26}$	\\
{\bf Edges} & & \\
$E_1$	&   0.536 fix.      	       &      $\cdots$  	\\
$\tau_1$	&   $0.27\pm0.06$   	       &      $\cdots$  	\\
$E_2$	&   0.543 fix.      	       &      $0.543\pm0.001$\\
$\tau_2$	&   $0.45\pm0.02$   	       &      $0.81\pm0.02$	\\
$E_3$	&   0.549 fix.      	       &      $\cdots$  	\\
$\tau_3$	&   0.09$^{+0.07}_{-0.08}$     &      $\cdots$  	\\
\hline
\end{tabular}
}
\end{table}