\begin{table}%t3
\caption{\label{tab3}Mrk~509 absorption line parameters (rest-frame energies).}
%\centerline
{\small
\begin{tabular}{c c c c c c c c}
\hline\hline\noalign{\smallskip}
N & $E^a$           & $EW^a$    & $\Delta\chi^2$ & F-test & MC$^b$ & Id & $v/c$\\
obs. & (keV)             &  (eV)          &                             &            &                        & (FeXXVI)& \\
\hline\noalign{\smallskip}
1 & $8.29\pm0.05$  &  $-32\pm20$ & 9.6 & $\sim$99\% & 95\% &  K$\alpha$&0.172~$\pm$~0.005\\
    & $9.74\pm0.09$  & $\rm -59^{+18}_{-22}$ & 8 & $\sim$98.5\% & 87.5\% & K$\beta$ & 0.162~$\pm$~0.009 \\
2 & $\equiv$8.29$^c$ &  $\gsimeq$$-23$ & $\dots$ & $\dots$ & $\dots$ \\
   & $\equiv$9.74$^c$ &  $\gsimeq$$-32$  & $\dots$ & $\dots$ & $\dots$ \\
4 & $8.03\pm0.03$&   $-20\pm10$ & 16.5 & $\gsimeq$99.9\% & 99.8\% &K$\alpha$&0.141~$\pm$~0.003\\
    & $\equiv$ 9.74$^c$  &  $\gsimeq$$-17$  & \dots & \dots & \dots\\
5 & $\equiv$8.29$^c$ &  $\gsimeq$$-14$ & $\dots$ & $\dots$ & $\dots$ \\
   & $\equiv$9.74$^c$ &  $\gsimeq$$-17$  & $\dots$ & $\dots$ & $\dots$ \\
6 & $8.50\pm0.05$  &  $-20\pm12$ & 10.2 & $\sim$99.5\% & 95.5\% &K$\alpha$&0.196~$\pm$~0.005\\ 
    & $\rm 9.8^{+0.1}_{-0.2}$  &  $\rm -34^{+26}_{-29}$ & 7 & $\sim$98\% & 78\% & K$\beta$ &$\rm 0.17^{+0.02}_{-0.01}$\\[1mm]
\hline
\end{tabular}}
\par
\medskip
$^a$~Rest-frame energy. Errors are quoted at the 90{\%} and 68{\%} confidence for the first and second lines, respectively.  
$^b$~Significance calculated through Monte Carlo simulations. $^c$~Values frozen at the best-fit values obtained during obs.~1. 
\end{table}