| http://www.w3.org/ns/prov#value | - ce which generates a component of a diffraction image, such that at least one of the diffraction images generated by the diffractive device is formed from image components generated by a plurality of the tracks and wherein at least some tracks have diffracting grooves or other shapes on their surfaces, varying continuously in terms of orientation, curvature and/or spacing along the track, the vari
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