\begin{table}%t3
\caption{The strongest lines from the a\ls{3}{P} levels. The lines lacking experimental branching fractions (BFs) are either too weak to be detected or have wavelengths outside the observed spectral region. The residual is the total contribution from the transitions from the upper level not included in the table.}\label{tab:aresult}
\small%\begin{center}
 {
\begin{tabular}{ccrcclll} 
\hline \hline
%&&&&&&& \\[-8pt]
Upper level     & Lower level     & $\lambda_{\rm vac}$ (\AA) & BF$_{\rm exp}$ (\%) & BF$_{\rm th}$ (\%) & $A_{{\rm exp}}$ (s$^{-1}$)$^a$ & $A_{{\rm theory}}$ (s$^{-1}$) \\ 
%&&&&&&& \\[-8pt]
\hline
%&&&&&&& \\[-8pt]
a\ls[0]{3}{P}	& a$^3$F$_2$	  & 13752.83       &                 & 4.34           &                                   & 0.0302                           \\
		& a$^3$D$_2$	  & 8328.91 	   & 95.6 $\pm$ 4     & 95.6           & 0.75 $\pm$ $0.08$                           & 0.666                            \\ 
		& \multicolumn{2}{l}{Weaker transitions (total)}                      &            &     0.06                              &                 \\[3mm]
a\ls[1]{3}{P}   & a$^3$F$_2$	  & 13701.20       &                 & 1.48           &                                   & 0.0103                           \\
		& a$^3$F$_3$	  & 13854.39       &                 & 2.79           &                                   & 0.0195                           \\
		& a$^3$D$_2$	  & 8309.94        &                 & 7.98           &                                   & 0.0557                           \\
		& a$^3$D$_3$	  & 8386.63        & 40.0 $\pm$ 6     & 43.0           & 0.28 $\pm$ $0.06$                           & 0.300                            \\ 
		& a$^3$D$_1$	  & 8263.44        & 47.7 $\pm$ 7     & 44.7           & 0.34 $\pm$ $0.07$                           & 0.312                            \\ 
		& \multicolumn{2}{l}{Weaker transitions (total)}                      &            &        0.05                           &                 \\[3mm]
a\ls[2]{3}{P}   & a$^3$F$_3$	  & 13753.55       &                 & 0.87           &                                   & 0.0061                           \\
		& a$^3$F$_4$	  & 13953.56       &                 & 3.10           &                                   & 0.0217                           \\
		& a$^3$D$_2$	  & 8273.56        & 27.8 $\pm$ 5     & 34.2           & 0.23 $\pm$ $0.04$                           & 0.239                            \\
		& a$^3$D$_3$	  & 8349.57        & 58.7 $\pm$ 8     & 52.3           & 0.47 $\pm$ $0.07$                           & 0.366                            \\
		& a$^3$D$_1$	  & 8227.46        &                 & 9.09           &                                   & 0.0636                           \\
		& \multicolumn{2}{l}{Weaker transitions (total)}                      &           &  0.04                                  &                 \\
\hline                              
\end{tabular}}
{
$^a$ The uncertainty is derived from the uncertainty of the lifetimes and the branching fractions.}
%\end{center}
\end{table}