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Figure 12
Scattering vector [{\bf q} = \Delta q(n_{x},n_{y})] on a square lattice used for a 2D system of box size L. [{\bf q}] points at the same magnitude q are connected by concentric quarter circles up to [q = 8\Delta q]. If the system is a crystal of lattice constant a = L/5, then four points shown in red correspond to reciprocal-lattice points.

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