Correction to: Nature Methods, published online 28 November 2019.

In the HTML version of this article initially published, Jun Lan was listed as having present addresses of Missouri University of Science and Technology, Rolla, MO, USA, and, Munich, Germany. This author is not associated with these affiliations. In the PDF version, affiliations 7 and 8 were labeled “present address”; these affiliations are the respective authors’ main affiliations rather than present addresses. The errors have been corrected in the HTML and PDF versions of the article.