Correction to: Nature Astronomy https://doi.org/10.1038/s41550-020-1036-0, published online 16 March 2020.

In the version of this Article originally published, the temperatures in Fig. 3g were incorrectly listed as 1.00 × 10–6 and 2.20 × 10–7 K; they should have been 1.00 × 106 K and 2.20 × 107 K. Similarly, the temperatures in Fig. 3h were incorrectly listed as 2.00 × 10–4 K and 5.20 × 10–5 K; they should have been 2.00 × 104 K and 5.20 × 105 K. This has now been corrected.