Figure 6


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(a) The spatial structure of a hexagonal grating. The hexagon shows the spatial Wigner–Seitz primitive cell, the green features illustrate the grating structure, and the blue rectangle shows the non-primitive cartesian cell. (b) The spatial-frequency grid. The filled and empty dots represent the allowed and forbidden orders of the hexagonal lattice. The blue, yellow, and red circles have the same meaning as in Figure 2a.

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