| http://www.w3.org/ns/prov#value | - ns, including a structure to be tested, a correlator system comprising a first lens, a second transmissive means including a Fourier transformation of said structures, and a second lens,said second transmissive means being arranged in the common projection plane of said first and said second lens, at least one displaceable aperture means being arranged for scanning the Fourier transformation image
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