\begin{table}%t4
\caption{New Ir I lifetimes, wavelengths, branching fractions, and transition probabilities.}
\label{iribf1}
%\centerline
{\begin{tabular}{llrrrrrr}
\hline \hline \noalign{\smallskip}
Upper level   & Lower level & \multicolumn{1}{c}{$\sigma$}    &
\multicolumn{1}{c}{$\lambda_{{\rm air}}$}
& \multicolumn{1}{c}{$BF_{\exp.}$} & \multicolumn{1}{c}{$BF_{\rm th.}$} & 
\multicolumn{1}{c}{$A_{ik}$}
&\multicolumn{1}{c}{Unc.} \\
lifetime           &             & \multicolumn{1}{c}{(cm$^{-1}$)} & \multicolumn{1}{c}{(\AA)}
&&& \multicolumn{1}{c}{(10$^{6}$~s$^{-1}$)}& \multicolumn{1}{c}{(\%)} \\
\noalign{\smallskip} \hline \noalign{\smallskip}
5d$^{7}6s$($^{5}$F)6p z $^{6}{\rm F}_{11/2}$  & 5d$^{7}$6s$^{2}$ a$^{4}$F$_{9/2}$  &
28~452.318 & 3513.647 & 0.892  & 0.973 & 2.79  &9\\
$\tau= 320$ ns                    & 5d$^{8}$($^{3}$F)6s b$^{4}$F$_{9/2}$&
25~617.333 & 3902.501 & 0.107  & 0.026 & 0.33  &11\\
 & \textit{Residual} &  &  & 0.001  &  &  \\
5d$^{7}6s$($^{5}$F)6p z $^{6}{\rm D}_{9/2}$     & 5d$^{7}$6s$^{2}$ a$^{4}$F$_{9/2}$
& 26~307.462 & 3800.124 & 0.965  & 0.996 & 1.67  &2\\
$\tau= 580$$^{a}$ ns              & 5d$^{8}$($^{3}$F)6s b$^{4}$F$_{9/2}$ &
23~472.485 & 4259.108 & 0.031  &0.001& 0.05  &7\\
                                         & \textit{Residual}
&     &           & 0.001  &        &  \\  \noalign{\smallskip} \hline
\end{tabular}}
{ $^{a}$ Lifetime measurements by \citet{Gough83}.}
\end{table}