\begin{center}
\begin{tabular}{@{}rrrr@{}}
\toprule
$m$ & Per-gate action $u_m(1/2)$ & Total $U_m(1/2)$ & $U_m/m^3$ \\
\midrule
2 & 1.227947 & 2.455894 & 0.306986794 \\
3 & 2.473223 & 7.419669 & 0.274802555 \\
4 & 4.198840 & 16.795358 & 0.262427471 \\
8 & 16.133129 & 129.065035 & 0.252080147 \\
16 & 63.909228 & 1022.547648 & 0.249645422 \\
32 & 255.019433 & 8160.621842 & 0.249042415 \\
64 & 1019.461602 & 65245.542547 & 0.248891993 \\
\bottomrule
\end{tabular}
\end{center}