| http://www.w3.org/ns/prov#value | - e boundary line bases on a layered grating pattern including a structure not having a symmetrical plane perpendicular to both of the grating and the sectional plane, a diffraction efficiency can be regulated, a diffraction efficiency of ???nth order diffracted light beam of an ordinary and an extraordinary ray can be symmetrical about a 0th order light beam and a diffraction efficiency of a specif
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