Correction to: Nature https://doi.org/10.1038/s41586-023-06551-1 Published online 24 August 2023

In the version of the article initially published, there was an error in the tenth paragraph, where in the sentence now reading “… where CO flux dominates (positive; light yellow-white) and, conversely, where H2 emission prevails (negative; dark orange-red)”, the colours “light yellow-white” and “dark orange-red” were inadvertently swapped. This has been corrected in the HTML and PDF versions of the article.