| http://www.w3.org/ns/prov#value | - FIG. 17 is a graph of the spectral response for the mirror of FIG. 16 including a coating of silicon nitride having an optical thickness of about 2200 angstroms on glass followed by a layer of silicon having an optical thickness of about 1200 angstroms and a layer of silicon nitride having an optical thickness of about 2400 angstroms;
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