\begin{table}[H]
\centering
\begin{threeparttable}
\caption{Spatial-screen evidence diagnostics}
\label{tab:diagnostics}
\small
\begin{tabularx}{0.90\textwidth}{>{\raggedright\arraybackslash}Xcp{0.28\textwidth}}
\toprule
Diagnostic & Value & Interpretation \\
\midrule
Public route candidates & 22 & Candidate frame \\
Coordinates require manual validation & 13 & 13 of 22 routes \\
Per-km versus area-density rank correlation & 0.939 & End-cap diagnostic \\
Top-six overlap: per-km versus area density & 5/6 & Definition sensitivity \\
Stable absolute-exposure flags & 4 & Selection frequency at least 0.8 \\
Stable efficiency flags & 4 & Selection frequency at least 0.8 \\
Routes passing strict frontier gate & 0 & No primary frontier ranking \\
\bottomrule
\end{tabularx}
\begin{tablenotes}
\footnotesize
\item Notes: Stability is computed from 200 fixed-seed coordinate perturbations. Frequencies summarize scenario sensitivity; they are not probabilities that a route is truly exposed.
\end{tablenotes}
\end{threeparttable}
\end{table}