\begin{table}%t2
\caption{Experimentally determined transition probabilities compared to theoretical values from a~$^4$G$_{11/2}$.} \label{BFs} %\centering
\par
\begin{tabular}{@{}lllll}     % 7 columns
\hline\hline\noalign{\smallskip}
\multicolumn{2}{l}{Transition} & \multicolumn{3}{l}{$A$ (s$^{-1}$)} \\
 & $\lambda_{\rm air}$ (\AA) & This work & \multicolumn{2}{c}{\citeauthor{Quinet} (\citeyear{Quinet})} \\
  & & & SST & HFR \\
\hline\noalign{\smallskip}
a$^4$F$_{9/2}$--a$^4$G$_{11/2}$ & 4243.97 & 1.05(15) & 1.02 & 1.12 \\
a$^4$F$_{7/2}$--a$^4$G$_{11/2}$ & 4346.85 & 0.25(5) & 0.23 & 0.25 \\
\hline
\end{tabular}
\vspace*{8mm}
\end{table}