| http://www.w3.org/ns/prov#value | - Which wavelengths are critical is a function of the fixed retarder thickness and type; the adjustment limits of the variable retarder; the tuning criterion for the stage, such as achieving a retardance of N, or N+???, or N+???, or N+???, for integral N; and the rules for choosing which value of Rvariable to use, if more than one is within its range.
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