| http://www.w3.org/ns/prov#value | - Further, X-ray absorption can be considerably reduced, particularly in the case of the hollow cylinder type unit lenses 12, by, as shown in FIG. 9(a), providing between each pair of adjacent unit lenses gaps of width ts that extend from the lens peripheries in the direction perpendicular to the array axis XC. In this case, the aforesaid intensity correction element 31 may be unnecessary, though it
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