\begin{table}[!hbt]
\centering
\small
\renewcommand{\arraystretch}{1.1}

\resizebox{\textwidth}{!}{%
\begin{tabular}{cccc}
% ================== Frame-specific (1D) ==================
\begin{tabular}{|l|c|}
\hline
\multicolumn{2}{|c|}{\textbf{Frame-specific (1D)}}\\
\hline
\textbf{Method} & \textbf{Time (s)} \\
\hline
Rand                 & 10.59 $\pm$ 5.46 \\
Gauss-1D             & 10.63 $\pm$ 5.42 \\
Equi                 & 10.65 $\pm$ 5.47 \\
\textit{kt}Gauss-1D  & 10.58 $\pm$ 5.45 \\
\textit{kt}Equi      & 10.62 $\pm$ 5.43 \\
Opt                  & 10.74 $\pm$ 5.54 \\
Adpt-ACSInit         & 11.27 $\pm$ 5.77 \\
Adpt-EqInit-I        & 11.05 $\pm$ 5.71 \\
Adpt-EqInit-II       & 11.33 $\pm$ 5.81 \\
Adpt-\textit{kt}EqInit-I & 11.24 $\pm$ 5.81 \\
\hline
\end{tabular}
&
% ================== Unified (1D) ==================
\begin{tabular}{|l|c|}
\hline
\multicolumn{2}{|c|}{\textbf{Unified (1D)}}\\
\hline
\textbf{Method} & \textbf{Time (s)} \\
\hline
Rand           & 11.07 $\pm$ 5.74 \\
Gauss-1D       & 10.66 $\pm$ 5.47 \\
Equi           & 10.96 $\pm$ 5.65 \\
Opt            & 10.52 $\pm$ 5.42 \\
Adpt-ACSInit   & 11.10 $\pm$ 5.73 \\
Adpt-EqInit-I  & 10.92 $\pm$ 5.58 \\
Adpt-EqInit-II & 10.71 $\pm$ 5.50 \\
\hline
\end{tabular}
&
% ================== Frame-specific (2D) ==================
\begin{tabular}{|l|c|}
\hline
\multicolumn{2}{|c|}{\textbf{Frame-specific (2D)}}\\
\hline
\textbf{Method} & \textbf{Time (s)} \\
\hline
Gauss-2D       & 10.70 $\pm$ 5.46 \\
\textit{kt}Rad & 10.74 $\pm$ 5.48 \\
Opt            & 10.67 $\pm$ 5.47 \\
Adpt-ACSInit   & 11.17 $\pm$ 5.73 \\
\hline
\end{tabular}
&
% ================== Unified (2D) ==================
\begin{tabular}{|l|c|}
\hline
\multicolumn{2}{|c|}{\textbf{Unified (2D)}}\\
\hline
\textbf{Method} & \textbf{Time (s)} \\
\hline
Gauss-2D     & 10.92 $\pm$ 5.60 \\
Rad          & 11.07 $\pm$ 5.68 \\
Opt          & 10.62 $\pm$ 5.48 \\
Adpt-ACSInit & 11.05 $\pm$ 5.71 \\
\hline
\end{tabular}
\\
\end{tabular}
}% end resizebox
\vspace{-5pt}
\caption{Average inference times (in seconds) for all sampling and reconstruction configurations at $R=4$, measured on a single NVIDIA A100 GPU. Each table reports the mean and standard deviation of total runtime per test volume, including both the sampling step (adaptive or non-adaptive) and the subsequent reconstruction.}
\label{tab:times}
\end{table}
