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Science 4 September 1970:
Vol. 169. no. 3949, p. 963
DOI: 10.1126/science.169.3949.963-a
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Erratum

The second sentence of the cover legend (24 July, page 313) should have read "Mercury, whose apparent diameter is about 1/160 that of the sun, . . ."

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Science. ISSN 0036-8075 (print), 1095-9203 (online)