\section{Additional segmentation-head uncertainty plots.}\label{ap:plots_seg}
We provide full histogram and eCDF visualisations for all segmentation-head uncertainties ($u_{\mathrm{ale}},u_{\mathrm{epi}},u_{\mathrm{vac}}$) at the instance level, separately for PanNuke and Ki-67 and for both evidential variants.  
Specifically, Figures~\ref{fig:seg_inst_pannuke_ours} and \ref{fig:seg_inst_ki67_ours} show the results for \textit{Ours} on PanNuke and Ki-67 respectively, while Figures~\ref{fig:seg_inst_pannuke_oursw} and \ref{fig:seg_inst_ki67_oursw} report the corresponding plots for \textit{Ours w}.  
These visualisations complement the main paper results and consistently show strong separation between correct and incorrect nuclei across datasets and uncertainty types.


\begin{figure}[t]
\centering

% --- Top row: Histograms ---
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_pannuke/hist_edl_ale.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_pannuke/hist_edl_epi.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_pannuke/hist_vacuity.png}


% --- Bottom row: ECDFs ---
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_pannuke/ecdf_edl_ale.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_pannuke/ecdf_edl_epi.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_pannuke/ecdf_vacuity.png}

\caption{Instance-level histograms (top) and eCDFs (bottom) for segmentation uncertainties ($u_{\mathrm{ale}}$, $u_{\mathrm{epi}}$, $u_{\mathrm{vac}}$) on PanNuke, \textit{Ours}. Errors in red, correct nuclei in blue.}
\label{fig:seg_inst_pannuke_ours}
\end{figure}


\begin{figure}[t]
\centering

% --- Top row ---
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_ki67/hist_edl_ale.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_ki67/hist_edl_epi.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_ki67/hist_vacuity.png}

% --- Bottom row ---
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_ki67/ecdf_edl_ale.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_ki67/ecdf_edl_epi.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_ki67/ecdf_vacuity.png}

\caption{Instance-level segmentation uncertainty histograms and eCDFs for Ki-67, \textit{Ours}. Errors in red, correct nuclei in blue.}
\label{fig:seg_inst_ki67_ours}
\end{figure}


\begin{figure}[t]
\centering

% --- Top row ---
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_pannuke/hist_edl_ale.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_pannuke/hist_edl_epi.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_pannuke/hist_vacuity.png}


% --- Bottom row ---
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_pannuke/ecdf_edl_ale.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_pannuke/ecdf_edl_epi.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_pannuke/ecdf_vacuity.png}

\caption{Instance-level segmentation uncertainty histograms and eCDFs for PanNuke, \textit{Ours w}. Errors in red, correct nuclei in blue.}
\label{fig:seg_inst_pannuke_oursw}
\end{figure}


\begin{figure}[t]
\centering

% --- Top row ---
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_ki67/hist_edl_ale.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_ki67/hist_edl_epi.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_ki67/hist_vacuity.png}


% --- Bottom row ---
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_ki67/ecdf_edl_ale.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_ki67/ecdf_edl_epi.png}\hfill
\includegraphics[width=0.30\textwidth]{figures/plots/seg_ins_w_ki67/ecdf_vacuity.png}

\caption{Instance-level segmentation uncertainty histograms and eCDFs for Ki-67, \textit{Ours w}. Errors in red, correct nuclei in blue.}
\label{fig:seg_inst_ki67_oursw}
\end{figure}
