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- Data probes
- 1D - point probes (Exvis)
- 2D - slicing planes in a volume
- 2D - Region of Interest (ROI) in images
- 3D - several slices in concert
- nD - restriction of some dimensions (nVision) - Memory-based vs. DBMS-based
- may require resampling of data
- need to correctly handle real time data