\begin{table}%t9
\caption{\label{tabn2dp21}Hyperfine components and $A_{ul}$ Einstein spontaneous emission coefficients of the \jdub transition of N$_2$D$^+$.}
\small%\centerline
 {
 \begin{tabular}{cccccccc}
 \hline\hline
  $J'$ & $F_1'$ &  \multicolumn{2}{c}{$F' \rightarrow J$}  & $F_1$ & $F$ & \multicolumn{1}{c}{Frequency$^{{a}}$} & \multicolumn{1}{c}{$A_{ul}$} \cr
  &&&&&& \multicolumn{1}{c}{(MHz)}& \multicolumn{1}{c}{(s$^{-1}$)}\cr
 \hline
2&2&2&1&2&1&154~214.8196& $7.402(-6)$\\
2&2&2&1&2&3&154~215.0138& $7.676(-6)$\\
2&2&1&1&2&1&154~215.1417& $3.701(-5)$\\
2&2&3&1&2&3&154~215.2619& $4.387(-5)$\\
2&2&2&1&2&2&154~215.3052& $3.427(-5)$\\
2&1&1&1&0&1&154~215.3991& $1.097(-4)$\\
2&2&3&1&2&2&154~215.5533& $5.483(-6)$\\
2&1&2&1&0&1&154~215.6021& $1.097(-4)$\\
2&2&1&1&2&2&154~215.6273& $1.234(-5)$\\
2&1&0&1&0&1&154~215.8617& $1.097(-4)$\\
2&2&2&1&1&1&154~216.7277& $1.110(-4)$\\
2&3&3&1&2&3&154~216.7920& $2.193(-5)$\\
2&2&2&1&1&2&154~216.8629& $3.701(-5)$\\
2&2&1&1&1&1&154~217.0498& $6.169(-5)$\\
2&3&3&1&2&2&154~217.0834& $1.755(-4)$\\
2&3&2&1&2&1&154~217.1055& $1.658(-4)$\\
2&2&3&1&1&2&154~217.1110& $1.481(-4)$\\
2&3&4&1&2&3&154~217.1807& $1.974(-4)$\\
2&2&1&1&1&2&154~217.1850& $4.113(-6)$\\
2&3&2&1&2&3&154~217.2998& $8.773(-7)$\\
2&2&1&1&1&0&154~217.4764& $8.225(-5)$\\
2&3&2&1&2&2&154~217.5912& $3.071(-5)$\\
2&1&1&1&2&1&154~217.6972& $1.371(-6)$\\
2&1&2&1&2&1&154~217.9002& $5.483(-8)$\\
2&1&2&1&2&3&154~218.0944& $4.606(-6)$\\
2&1&0&1&2&1&154~218.1598& $5.483(-6)$\\
2&1&1&1&2&2&154~218.1828& $4.113(-6)$\\
2&1&2&1&2&2&154~218.3858& $8.225(-7)$\\
2&1&1&1&1&1&154~219.6053& $2.056(-5)$\\
2&1&1&1&1&2&154~219.7405& $3.427(-5)$\\
2&1&2&1&1&1&154~219.8083& $2.056(-5)$\\
2&1&2&1&1&2&154~219.9435& $6.169(-5)$\\
2&1&1&1&1&0&154~220.0320& $2.742(-5)$\\
2&1&0&1&1&1&154~220.0679& $8.225(-5)$\\
 \hline
\end{tabular}}
\medskip
$^{{a}}$ The frequency uncertainty is $\pm$2.1 kHz for all hyperfine components. 
\end{table}