\begin{table}%t4
\caption{Experimental and theoretical radiative lifetimes (in~ns) for odd-parity levels of~Os~II.}
\label{table:4}
%\centerline
{
\begin{tabular}{c c c cccc} 
\hline\hline                
$E$ (cm$^{-1}$)$^a$&  Config.$^a$   & $J$   &Expt   &Expt     & Theory \\
&&&Previous$^b$&This work$^c$&  This work$^d$\\
\hline                        
39~389.49    &$\rm 5d^56s(^7S)6p \ ^8P^\circ$    &7/2    &$68 \pm 5$ &$66 \pm 6$&    198\\
41~282.95    &$\rm 5d^56s(^7S)6p \ ^8P^\circ$    &9/2    &   &           &122\\
43~802.36    &$\rm 5d^6(^5D)6p \ ^6D^\circ$  &7/2    &$5.9 \pm 0.5$& $5.3 \pm 0.4$&  5.7\\
44~315.40    &$\rm 5d^6(^5D)6p \ ^6D^\circ$  &9/2    &   &$5.1 \pm 0.4$  &5.1\\
46~157.19    &$\rm 5d^6(^5D)6p \ ^6D^\circ$  &3/2    &$5.6 \pm 0.5$  &   &5.8\\
46~373.51    &$\rm 5d^6(^5D)6p \ ^6D^\circ$  &5/2    &$5.6 \pm 0.5$  &$6.0 \pm 0.6$& 5.6\\
48~128.08    &$\rm 5d^6(^5D)6p \ ^6D^\circ$  &1/2    &$5.9 \pm 0.5$  &   &5.6\\
48~798.70    &$\rm 5d^6(^5D)6p \ ^6F^\circ$  &5/2    &$6.7 \pm 0.5$& &   7.4\\
49~149.39    &$\rm 5d^56s(^7S)6p \ ^6P^\circ$    &7/2    &   &$6.7 \pm 0.6$& 6.4\\
51~770.38    &$\rm 5d^56s(^7S)6p \ ^6P^\circ$    &5/2    &   &   &8.2\\
51~951.61    &$\rm 5d^6(^5D)6p \ ^6F^\circ$  &9/2    &$3.2 \pm 0.3$& $3.2 \pm 0.3$&  3.9\\
52~206.48    &$\rm 5d^6(^5D)6p \ ^6F^\circ$  &7/2    &$4.7 \pm 0.4$  &$4.9 \pm 0.4$& 4.6\\
54~379.27    &$\rm 5d^6(^5D)6p \ ^4F^\circ$  &7/2    &   &$4.0 \pm 0.4$& 4.3\\
54~445.19    &$\rm 5d^6(^5D)6p \ ^4D^\circ$  &5/2    &   &$4.2 \pm 0.4$& 4.0\\
\hline                                   
\end{tabular}}
\medskip
$^a$ Van Kleef \& Klinkenberg (\cite{Vankle61});
$^b$ Ivarsson et~al. (\cite{Ivars04});
$^c$ LIF~measurements (see text);
$^d$ HFR~calculations (see text).
\end{table}