In the Commentary 'ψ in the sky' (Nature Physics 11, 615–617; 2015), the resolution of GOCE in Fig. 1 was misleading. The spatial resolution of GOCE is application specific, and in fact can reach less than 100 km for a recovery error of the geoid of 2 cm. This has now been clarified in the online versions after print 20 October 2015.
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The online version of the original article can be found at 10.1038/nphys3427
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Correction. Nature Phys 11, 885 (2015). https://doi.org/10.1038/nphys3571
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DOI: https://doi.org/10.1038/nphys3571