| http://www.w3.org/ns/prov#value | - The reference line 340 of FIGS. 9 and 10 is preferably formed as a physical ridge or step in the surface, to facilitate alignment of an article-under-test 20 by positioning the edge of article 20 against the ridge or step. [0050] Thus, one important aspect of the invention is an apparatus for authenticating an article, the apparatus including a housing, a receptor within the housing for receiving
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