| http://www.w3.org/ns/prov#value | - As a development of the second preferred embodiment obtained by expanding the above concept, the optical depths of all of the grooves 84, the grooves 92, and the phase pits 94 may be set to (2n+1)??/8 (n is a positive integer), and the effective optical depth of each phase pit 96 formed in the land header region 90 may be set to (2m???1)??/4 (m is a positive integer).
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