P. Kaaret's Correspondence letter (Nature 427, 287; 200410.1038/427287b) should have included the expression (χ<10−4), not (χ<104). Nature apologizes for this error.
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Correction. Nature 427, 393 (2004). https://doi.org/10.1038/427393e
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DOI: https://doi.org/10.1038/427393e
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