The caption to Corinne Charbonnel's News & Views article of 3 January — “Cosmology: A baryometer is back” (Nature 415, 27–28; 2002) — should have read “primordial abundances of 4He (observed in extra-galactic [not galactic] H ii regions)”.
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The online version of the original article can be found at 10.1038/415027a
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Correction. Nature 415, 278 (2002). https://doi.org/10.1038/415278a
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DOI: https://doi.org/10.1038/415278a
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