\begin{table}%t1
%\centering
\par
\caption{\label{table:constraint}Upper limits on conversion efficiencies from spin-down power.}
\begin{tabular}{cccc|c}
\hline\hline
\multicolumn{4}{c|}{Model (\ddag) [$E_{\min}~({\rm GeV})$, $\alpha$]} & Measured $\langle L_{\rm sd} \rangle$ \\
100, 2.1 & 100, 3.0 & 1, 2.1 & 1, 3.0  & \\
\hline
\multicolumn{4}{c|}{$\epsilon_{\rm e}$} & $\epsilon_{\rm sd}^{1-10}$ \\
\hline
 0.003 & 0.01 & 0.01 & 0.6 & 0.007 \\
\hline
\end{tabular}
\end{table}