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. 2021 Mar 31;65(4):1296–1313. doi: 10.1007/s00454-021-00281-9

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© The Author(s) 2021

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Fig. 4 — Six points in the plane and a pink ball of radius r centered at each. The black order-2 Voronoi tessellation decomposes the twofold cover into convex pieces. The corresponding subcomplex of the dual order-2 Delaunay mosaic is superimposed in blue