\resizebox{\textwidth}{!}{%
\begin{tabular}{@{}lrrrrr@{}}
\toprule Classes & Theory & Iterations$/\sqrt n$ (95\% CI) & Iteration speed-up (paired, 95\% CI) & ns per iteration & Wall-clock speed-up \\ \midrule
none (plain rho, $r=128$) & $\sqrt{\pi/2} = 1.253$ & 1.206 [1.114, 1.299] & 1 & 38 & 1 \\
$\{\pm P\}$ (negation) & $\sqrt2 = 1.414$ & 0.933 [0.865, 1.006] & 1.293 [1.158, 1.439] & 56 & 0.73 [0.65, 0.83] \\
$\{P,\phi P,\phi^2P\}$ & $\sqrt3 = 1.732$ & 0.797 [0.742, 0.849] & 1.515 [1.375, 1.674] & 71 & 0.75 [0.65, 0.86] \\
order-6 orbits, $r=128$ & $\sqrt6 = 2.449$ & 0.546 [0.510, 0.581] & 2.209 [2.001, 2.450] & 80 & 0.95 [0.84, 1.09] \\
order-6 orbits, $r=20$ & $\sqrt6 = 2.449$ & 0.499 [0.462, 0.536] & 2.419 [2.185, 2.702] & 83 & 0.95 [0.83, 1.08] \\
\bottomrule
\end{tabular}}