| http://www.w3.org/ns/prov#value | - ce on said circle to said concave element, with its beam axis intersecting the center of said concave element, said means including a sample, and said virtual point source is on the face of said sample, said sample being positioned to reflect a radiation beam to said concave element, said means further including means for generating an X-ray beam and means for focusing said X-ray beam onto said po
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