\begin{table}[htbp]\centering
\caption{Living-area elasticity by size segment (piecewise-linear spline, grand model)}
\label{tab:spline}
\begin{threeparttable}
\begin{tabular}{lcc}
\toprule
Segment & Living area (m$^2$) & Elasticity \\
\midrule
1 & 46--87 & \makecell{0.571\\\scriptsize(0.021)} \\
2 & 87--113 & \makecell{0.650\\\scriptsize(0.021)} \\
3 & 113--149 & \makecell{0.584\\\scriptsize(0.022)} \\
4 & 149--209 & \makecell{0.409\\\scriptsize(0.017)} \\
5 & 209--465 & \makecell{0.477\\\scriptsize(0.013)} \\
\midrule
$R^2$: linear / quadratic / spline & \multicolumn{2}{c}{0.7756 / 0.7765 / 0.7767} \\
\bottomrule
\end{tabular}
\begin{tablenotes}\footnotesize\item Notes: Linear spline in $\ln(\text{area})$ with knots at the quintiles of living area, all other grand-model controls and FSA fixed effects included. Each entry is the elasticity of price with respect to area within the segment; FSA-clustered standard errors in parentheses.
\end{tablenotes}
\end{threeparttable}
\end{table}