\begin{figure}[htbp]
\centering
  \subfigure[][]{\label{subfig:gruidedbp}\includegraphics[width=0.22\linewidth]{./images/GD_BP_avg_AD_slice_nr_34.pdf}}
  \subfigure[][]{\label{subfig:grad-cam}\includegraphics[width=0.22\linewidth]{./images/Grad_CAM_avg_AD_slice_nr_34.pdf}}
  \subfigure[][]{\label{subfig:fixations_roi}\includegraphics[width=0.22\linewidth]{./images/original_scan_all_fixations_roi_34.pdf}}

  \caption{Examples of localization maps using Guided Backpropagation \protect\subfigref{subfig:gruidedbp} and Grad-CAM \protect\subfigref{subfig:grad-cam} techniques for the standard ResNet18 for the task NC vs AD. Each of the maps presented is an average of the generated guided backpropagation and Grad-CAM output for all AD scans available. These maps highlight the regions of the brain image more activated in the network to make the prediction. \protect\subfigref{subfig:fixations_roi} ROI and fixation points are displayed for comparison.}
  \label{fig: explainability}
\end{figure}