Fig. 3: A plane self-penetrating net with multiplicity of 2 and its QG.
From: Determining dimensionalities and multiplicities of crystal nets
a A twofold self-penetrating net. The black box is the unit cell of the square lattice. The red and blue dash lines and points represent the disconnected subnets. The red solid box is the basic building block of the red subnet. b The relative quotient graph.
