\begin{tabular}{llrr}
\toprule
Method & Note & Bits/weight & PPL $\downarrow$ \\
\midrule
bf16 (reference) & --- & 16.00 & 8.11 \\
\midrule
RTN uniform, group 128 & scalar baseline & 3.25 & 10.49 \\
RTN uniform, group 128 & scalar baseline & 2.25 & 22793.90 \\
RVQ, data-free & no LDLQ & 1.51 & 7701.98 \\
RVQ + LDLQ, no rotation & no incoherence proc. & 1.51 & 352.10 \\
RVQ + RHT + LDLQ (ours) &  & 1.01 & 156.07 \\
RVQ + RHT + LDLQ (ours) &  & 1.51 & 25.54 \\
RVQ + RHT + LDLQ (ours) &  & 2.01 & 12.17 \\
\quad + frequency-cond. alloc. & rate-matched & 1.51 & 22.02 \\
\bottomrule
\end{tabular}