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Nature 348, 499-502 (1990). IN this Article in the 6 December 1990 issue, an error in the Nature office led to mislabelling of a ring in Fig. 1. A corrected version appears below and in reprints. In addition some labelling was omitted from Fig. 2, shown on the right.

Erratum: Orbits of shepherd satellites deduced from the structure of the rings of Uranus