Nature 419, 824–826 (2002).
On page 825 of this Letter, the equation should not have contained ‘kern +1’ in the second term. The equation should read:

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The online version of the original article can be found at 10.1038/nature01130
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Chen, J., Weldner, D. & Vaughan, M. Erratum: The strength of Mg0.9Fe0.1Si03 perovskite at high pressure and temperature. Nature 420, 700 (2002). https://doi.org/10.1038/nature01293
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DOI: https://doi.org/10.1038/nature01293