\begin{table}[t]
\centering
\caption{Leave-one-out component ablation of TC-SegFormer, block split, fold 1, seed 42. Each row removes a single component from the full model; all other settings are held fixed. A larger drop relative to the first row indicates a larger contribution.}
\label{tab:ablation}
\begin{tabular}{lcccccc}
\hline
Configuration & mIoU & core mIoU & IoU$_\mathrm{Road}$ & IoU$_\mathrm{River}$ & clDice$_\mathrm{Road}$ & clDice$_\mathrm{River}$ \\
\hline
TC-SegFormer (full) & 0.5582 & 0.6199 & 0.4382 & 0.4806 & 0.3955 & 0.3353 \\
\hline
$-$ detail path & 0.5449 & 0.6094 & 0.4087 & 0.4414 & 0.3819 & 0.2657 \\
$-$ CSA reweighting & 0.5564 & 0.6139 & 0.4395 & 0.4729 & 0.3954 & 0.3065 \\
$-$ soft-clDice & 0.5522 & 0.6127 & 0.4223 & 0.4644 & 0.3745 & 0.2689 \\
$-$ balanced sampler & 0.5509 & 0.6126 & 0.4307 & 0.4776 & 0.3896 & 0.3211 \\
\hline
\end{tabular}
\end{table}