\begin{table}%t6
\par
%\centering
\par
\caption{Spectral fit of absorption edge(s). $\tau$ is the optical depth. 
Significant detections ($\geq$99$\%$)  are marked in bold face. 
\label{tab:WA}}
\begin{tabular}{l|ccc|ccc}
\hline
\hline
 \multicolumn{1}{c|}{Object}  & $\tau_{\rm O VII}$  & $\tau_{\rm O VIII}$ & Detection & \multicolumn{2}{|c}{Edge parameters} & Detection \\
                             & ($E=0.74$~keV) &  ($E=0.87$~keV)&         &   $E$ (keV)          &  $\tau$    & \\
%\noalign {\smallskip}  
\hline
I~Zw1 & 0.11~$\pm$~0.04 & $<$0.01 & {\bf 99.9$\%$} & 0.65~$\pm$~0.02 & 0.21~$\pm$~0.04  & {\bf $>$99.99$\%$} \\
%\noalign {\smallskip}  
PG~0804+761 &$<$0.09 & 0.07~$\pm$~0.06 & 90.3$\%$ & 0.62~$\pm$~0.04  &0.16~$\pm$~0.09 & {\bf 99.2$\%$}\\
             &       &               &         & 0.95~$\pm$~0.05  & 0.13~$\pm$~0.06\\
%   \noalign {\smallskip}  
PG~0947+396 & $<$0.10  & 0.15~$\pm$~0.08 & {\bf 99.8$\%$} & 0.85~$\pm$~0.04   & 0.16~$\pm$~0.08  & {\bf 99.9$\%$}\\
%\noalign {\smallskip}
PG~1114+445 & 2.26$^{+0.22}_{-0.19}$  &  0.32~$\pm$~0.16  & {\bf $>$99.99$\%$} & 0.72~$\pm$~0.01  & 2.23~$\pm$~0.17  & {\bf $>$99.99$\%$} \\
             &                    &                 &                   & 0.93~$\pm$~0.03  &  0.53~$\pm$~0.13 & \\
%\noalign {\smallskip}  
PG~1115+407 & $<$0.19  & 0.08~$\pm$~0.06 & 91.8$\%$ & 0.78~$\pm$~0.05  & 0.15~$\pm$~0.08  & {\bf 99.4$\%$}\\
             &          &              &         & 1.18~$\pm$~0.10 &  0.15~$\pm$~0.07 & \\  
%\noalign {\smallskip}  
PG~1116+215 & $<$0.19    & 0.09~$\pm$~0.07   & 97.7$\%$   & \\
%\noalign {\smallskip}  
PG~1202+281 &  0.09~$\pm$~0.07  & $<$0.13 & {\bf 99.9$\%$}& 0.80~$\pm$~0.05   & 0.13~$\pm$~0.07 &  {\bf 99.92$\%$}  \\
%\noalign {\smallskip}  
 PG~1307+085 & 0.33$^{+0.20}_{-0.16}$ & $<$0.44 & {\bf 99.97$\%$}&  0.78~$\pm$~0.04 & 0.39~$\pm$~0.16 &{\bf 99.97$\%$} \\
%\noalign {\smallskip}  
 PG~1309+355&0.46$^{+0.20}_{-0.15}$ & $<$0.25 & {\bf 99.98$\%$} & 0.75~$\pm$~0.03 & 0.49~$\pm$~0.17  & {\bf 99.97$\%$}\\
%\noalign {\smallskip}  
PG~1352+183&  0.11~$\pm$~0.08 & $<$0.08 & 97.0$\%$ & 0.72~$\pm$~0.06 & 0.12~$\pm$~0.08  & {\bf 99.7$\%$}\\
%\noalign {\smallskip}  
Mrk~876 & $<$0.23  & 0.25~$\pm$~0.12 & {\bf 99.92$\%$} & 0.93~$\pm$~0.05 & 0.26~$\pm$~0.11   &  {\bf 99.97$\%$}\\
\hline
\end{tabular}
\end{table}