| http://www.w3.org/ns/prov#value | - ng plate being arranged between said first polarizer and first analyzer; a second phase-shifting plate of said means, arranged between said second polarizer and second analyzer; said first and second phase-shifting plates having phase angles differing by an angle n??, wherein n is an odd integer, and ?? = 3.14 . . . ; said first and second polarizers as well as said first and second analyzers bein
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