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Click here for Wookieepedia's article on the Canon version of this subject.  This article covers the Legends version of this subject. 

Holo-tank on Yavin 4.

Holo-tanks were devices which projected a holographic image which gave the viewer the impression of being "in" the image. It was a three-dimensional visual projection area resembling a small amphitheater. The holo-tank was completely circular and recessed below the level of the floor. Observers stood around its outer edge and looked into it. Holo-tanks were primarily employed in military command centers to observe tactical movements. Targets were displayed as points of light and located in a true, scaled-down position with respect to some reference point. A three-dimensional grid system, that was superimposed over the holo-tank projection field of regard, allowed for the easy location of targets.

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