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These visualizations were seen to disagree due to raw data reduction (as with dose surfaces), use of simplified geometries (as with dose mapping), and voxel vs. point data (as with dose surfaces vs. DVHs). In practice, in the presence of such disagreement, how can we know which (if any) is the more accurate representation of the true data? Unlike this presentation, we generally will have no idea of what is going on behind the scene.