\begin{table}%T6
%\centering
\par
\caption{SAC fit parameters for the permitted Fe~{\scriptsize II} narrow component
lines. $p$ (${\rm eV^{-1}}$), ${X}_{\rm c}$, $q$ (${\rm eV^{-1}}$)
and ${Y}_{\rm c}$ are fitting parameters, $\chi^{2}$ is a measure
of the fitting precision.\label{TAB-fit_N}}
\par
\begin{tabular}{cccc}
\hline \hline 
year&
1995&
1999&
2001\\
\hline 
$p$&
$1.32\pm0.33$&
$1.28\pm0.23$&
$0.94\pm0.31$\\
%\hline 
${X}_{\rm c}$&
$-7.27\pm0.09$&
$-7.52\pm0.08$&
$-7.37\pm0.11$\\
%\hline 
$q$&
$1.79\pm0.19$&
$1.60\pm0.16$&
$1.28\pm0.17$\\
%\hline 
${Y}_{\rm c}$&
$-17.00\pm0.54$&
$-17.40\pm0.47$&
$-18.37\pm0.47$\\
%\hline 
$N$ lines&
50&
50&
28\\
\hline 
red.$\chi^{2}$&
0.65&
0.45&
0.34\\
\hline
\end{tabular}
\end{table}