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Strong reflections in a reciprocal-lattice plane perpendicular to an icosahedral twofold axis in a crystal of tobacco bushy stunt virus. Left, precession photograph of a zero-layer reciprocal-lattice plane; right, weighted reciprocal lattice. Shown also are the directions of the NCS fivefold, threefold and twofold symmetry axes. The original figure is published courtesy of Donald L. D. Caspar.
