\begin{table}%t3
%%\centering
\par
\caption{Radiative decay fractions.}\label{table:einstein}
%\centerline
{\small \begin{tabular}{lcc}
\hline\hline
\multicolumn{1}{c}{Quantity} &\multicolumn{1}{c}{Value} &
\multicolumn{1}{c}{Relevance}\\
\hline
$B_{3p,2s}$ & 0.1183 & H$\alpha$, Ly$\beta$\\
$B_{4s,2p}$ & 0.5841 & H$\beta$, P$\alpha$\\
$B_{4s,3p}$ & 0.4159 & H$\beta$, P$\alpha$\\
$B_{4p,1s}$ & 0.8402 & H$\beta$, Ly$\gamma$, P$\alpha$\\
$B_{4p,2s}$ & 0.1191 & H$\beta$, Ly$\gamma$, P$\alpha$\\
$B_{4p,3s}$ & 3.643$_{-2}$ & H$\beta$, Ly$\gamma$, P$\alpha$\\
$B_{4p,3d}$ & 4.282$_{-3}$ & H$\beta$, Ly$\gamma$, P$\alpha$\\
$B_{4d,2p}$ & 0.7456 & H$\beta$, P$\alpha$\\
$B_{4d,3p}$ & 0.2544 & H$\beta$, P$\alpha$\\
\hline
\end{tabular}}
\medskip
Note that $A_b$ is shorthand notation for $A \times 10^b$.
\end{table}