\begin{table}%t6
\caption{\label{lifetimesNbIII} HFR  lifetimes ($\tau$~in~ns) (without and with core-polarization effects included) of the low-lying levels of Nb~III (4d$^2$5p~configuration). Only lifetime values larger than 1~ns are quoted.}
\par
%\centering
\par
\begin{tabular}{ccccc}
\hline\hline\noalign{\smallskip}
$E$ (cm$^{-1}$)\tablefootmark{a}       &  Term\tablefootmark{a}         &   $J$    &  $\tau$ (HFR) &  $\tau$ (HFR+CPOL)     \\
\hline\noalign{\smallskip}
63 686.7 &        $^4$G$^{\circ}$  &5/2  &   2.25        &  2.58         \\
65 005.9 &        $^4$G$^{\circ}$ &7/2    &   2.13        &   2.44        \\
65 904.2 &        $^4$F$^{\circ}$  & 3/2  &  1.01        &    1.16        \\
66 456.2 &        $^4$G$^{\circ}$  &9/2  &   2.02        &  2.32         \\
66 598.4 &       $^2$F$^{\circ}$  &5/2  &    1.21        &   1.39        \\
67 094.1 &        $^4$F$^{\circ}$  &5/2  &   1.20        &   1.37        \\
67 775.0 &        $^2$D$^{\circ}$  &3/2  &   1.17        &  1.33          \\
68 061.7 &      $^4$G$^{\circ}$  &11/2  &    1.96        &  2.25         \\
68 382.1 &        $^2$F$^{\circ}$  &7/2  &   1.56        &   1.78        \\
69 110.4 &        $^2$D$^{\circ}$  &5/2  &   1.20        &   1.37        \\
74 726.7 &        $^4$D$^{\circ}$  &1/2  &   1.40        &   1.62        \\
75 383.1 &        $^4$D$^{\circ}$  &3/2  &   1.02        &   1.13         \\
76 387.8? &      $^2$D$^{\circ}$  &5/2  &   1.00        &  1.16         \\
76 913.3? &      $^2$D$^{\circ}$  &3/2  &   1.03       &   1.20         \\
77 247.5 &        $^2$F$^{\circ}$  & 5/2  &  1.28        &   1.46        \\
78 085.9 &       $^4$P$^{\circ}$  &1/2  &    1.16        &   1.34         \\
78 372.2 &       $^4$P$^{\circ}$  &3/2  &    1.20        &   1.38         \\
79 429.7 &       $^4$P$^{\circ}$  &5/2  &    1.18        &  1.35         \\
82 152.1 &       $^2$H$^{\circ}$  &11/2  &   1.33        &  1.52         \\
84 523.0 &        $^2$F$^{\circ}$  &7/2  &   1.08        &    1.23       \\[2pt]
\hline
\end{tabular}
\tablefoot {\tablefoottext{a}{From Iglesias (\cite{iglesias2}).}}
\end{table}