Corrections and Clarifications

Erratum

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Science  07 Dec 1990:
Vol. 250, Issue 4986, pp. 1320
DOI: 10.1126/science.1320-b

Abstract

In the Editors' response to the letter by George Legge (16 Nov., p. 889), the third sentence should have read, "However, the Oxford group claims the distinction of being, as Frank Watt puts it, ‘the first group to achieve 1-µm spot sizes and currently holds state-of-the-art performance of 300-µm beam spot for 100 pA of beam.’"