\begin{table}%t1
\caption{\label{Lifetimes}Experimentally determined lifetimes of metastable levels in \ion{Fe}{ii}. The uncertainties are given in brackets.}
%\centering
\par
\begin{tabular}{@{}llcccccccc}     % 7 columns
\hline\hline
& & \multicolumn{8}{c}{$\tau$ (s)} \\
Configuration & Term &  This work & Ref. [1] & Ref. [2] & Ref. [3] & Ref. [4] & Ref. [5]& Ref. [6] & Ref. [7]\\
\hline\noalign{\smallskip}
 3d$^54$s$^2$  & a~$^6$S$_{5/2}$ &  & 0.23(3) & & 0.326 & 0.235 & 0.262 & 0.220 &  0.222\\
 3d$^6$($^3$G)$4$s & a~$^4$G$_{11/2}$ & 0.75(10) & & & 0.852 &  & 0.774 & 0.704 & \\
 3d$^6$($^3$G)$4$s & a~$^4$G$_{9/2}$ &  & & 0.65(2) & 0.856 &  & 0.755 & 0.694 &\\
 3d$^6$($^3$H)$4$s & b~$^2$H$_{11/2}$ &  & & 3.8(3) & 10.1 &  & 6.59 & 5.20 & \\
 3d$^6$($^3$D)$4$s & b~$^4$D$_{1/2}$ & 0.54(3) & & & 0.677 & & 0.630 & 0.550 &\\
 3d$^6$($^3$D)$4$s & b~$^4$D$_{7/2}$ &  & 0.53(3) & & 0.618 & & 0.567 & 0.500 & \\
\hline
References: & \multicolumn{6}{l}{[1] \citeauthor{Rostohar} (\citeyear{Rostohar}) (Experimental)}\\
& \multicolumn{6}{l}{[2] \citeauthor{Hartman} (\citeyear{Hartman}) (Experimental)}\\
& \multicolumn{6}{l}{[3] \citeauthor{Garstang} (\citeyear{Garstang}) (Calculated)}\\
& \multicolumn{6}{l}{[4] \citeauthor{Nussbaumer} (\citeyear{Nussbaumer}) (Calculated, Superstructure code)}\\
& \multicolumn{6}{l}{[5] \citeauthor{Quinet} (\citeyear{Quinet}) (Calculated, Superstructure)}\\
& \multicolumn{6}{l}{[6] \citeauthor{Quinet} (\citeyear{Quinet}) (Calculated, relativistic Hartree-Fock)}\\
& \multicolumn{6}{l}{[7] \citeauthor{Hartman} (\citeyear{Hartman}) (Calculated, CIV3 code)}\\
\hline
\end{tabular}
\end{table}