English: Empty regions for the Euclidean minimum spanning tree: For the red edge shown, these regions cannot contain any other vertices of the tree. White: the empty lens defining the relative neighborhood graph. Light blue: the diameter circle defining the Gabriel graph and forming an empty circle for the Delaunay triangulation. Dark blue: a 60°–120° rhombus that cannot overlap with the rhombi of other spanning tree edges.
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Captions
Empty regions for the Euclidean minimum spanning tree