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Both theory and experiment show that the tails are reduced as the system magnification and source current are reduced."},{"label":"DOI","value":"10.1116/1.584117"},{"label":"Volume","value":"6"},{"label":"Issue","value":"6"},{"label":"Publication Date","value":"D:00 M:11 Y:1988"},{"label":"Publication Information","value":"Copyright 1988 American Vacuum Society. 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