| http://www.w3.org/ns/prov#value | - In a preferred embodiment, the beam separation box including the enclosure 1 contains suitable optics to split a certain beam portion 7 c (about 1% to 15%) of the main beam 7 a, and redirect the beam portion 7 c into the detector housing 2, and those optics may be alternatively to those described above, such as are described at the '552 and/or '952 applications, mentioned above.
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