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Science 21 December 1990:
Vol. 250. no. 4988, p. 1646
DOI: 10.1126/science.1646-b
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In Reply: Proton Microprobe Development

In the Erratum (7 Dec., p. 1320) about the Editors' response to George Legge's letter of 16 November (p. 889), the error was not corrected. Reference should have been made to a "300-nm beam spot," not a "300-µm beam spot."

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