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In this paper the authors present a Zoomable User Interface (ZUI) to navigate in a large hierarchical graph using two multitouch systems. The first system is implemented using the radar-TOUCH device , a sensor device based on laser technology that detects hand interaction on or in front of large planar surfaces. The second system uses a multitouch table that allows both for finger and pen interaction. The software running on the table serves as a navigation and analysis tool. Both systems use the same renderer to visualize a very large graph based diagram on a large vertical surface.
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