\begin{table*}[t]
\centering
\caption{Ablation study of multi-level temporal Mamba variants. L1 denotes the finest level. ``F-Var." represents the frame variance metric. Bold denotes the \textbf{best}. The full hierarchy achieves the best AbsRel, RMSE, F1, and temporal stability.}
\label{tab:mamba_ablation}
\footnotesize
\begin{tabular}{l|cccc|c|c|c|c|c|c}
\toprule
Methods & L1 & L2 & L3 & L4 & $\delta_1\uparrow$ & AbsRel$\downarrow$ & RMSE$\downarrow$ & L1$\downarrow$ & F1$\uparrow$ & F-Var.$\downarrow$ \\
\midrule
Mid-level only &  & \checkmark & \checkmark &  & 0.952 & 0.086 & 2.996 & 1.869 & 0.117 & 0.0129 \\
Fine only & \checkmark &  &  &  & 0.953 & 0.105 & 2.917 & \textbf{1.774} & 0.135 & 0.0137 \\
Fine+mid hierarchy & \checkmark & \checkmark &  &  & \textbf{0.954} & 0.087 & 2.975 & 1.817 & 0.124 & 0.0124 \\
Fine+mid hierarchy & \checkmark & \checkmark & \checkmark &  & 0.946 & 0.087 & 2.902 & 1.846 & 0.134 & 0.0124 \\
Full hierarchy & \checkmark & \checkmark & \checkmark & \checkmark & 0.952 & \textbf{0.085} & \textbf{2.739} & 1.780 & \textbf{0.143} & \textbf{0.0123} \\
\bottomrule
\end{tabular}
\end{table*}