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Figure 1
The Ewald construction. When the reciprocal-lattice point crosses the surface of the sphere, the trigonometric condition 1/d = (2/λ)sinθ is fulfilled. This is the three-dimensional illustration of Bragg's law λ = 2dsinθ.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 55| Part 10| October 1999| Pages 1703-1717
doi:10.1107/S0907444999008367
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