Correction to: Nature Astronomy https://doi.org/10.1038/s41550-020-1088-1, published online 11 May 2020.

In the version of this Letter originally published, Luca Latronico’s affiliation was incorrectly listed as ‘INFN-Pisa, Pisa, Italy’; it should have been ‘INFN, Sezione di Torino, Torino, Italy’. This has now been corrected.