| http://www.w3.org/ns/prov#value | - In this regard, the focusing center may be any portion of a magnetic or other focusing field which tends to provide a desired focusing (e.g., convergent or divergent, as desired) of an ion beam, wherein the focusing field may provide one or more such focusing centers along the portion of the scan plane proximate the focusing system 140, where at least one such focusing center is located generally
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