| http://www.w3.org/ns/prov#value | - Slices A and C differ byan in-plane translation, and slices B and D are a 90?? rotationfrom slices A and C. In a very crude picture, the top layer ofthe proposed phase mask can be thought of as creating atwo-dimensional diffraction pattern which generates the Aand C slices of the desired shape, while the bottom layergenerates a similar diffraction pattern that is rotated by 90??and translated in t
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