Typo there: 400 miles. The actual paper's abstract [1] says "~650-km". In a skim through I didn't see anything that might correspond to the strange 1600km dep

Typo there: 400 miles. The actual paper's abstract [1] says "~650-km". In a skim through I didn't see anything that might correspond to the strange 1600km depth. [1] https://www.nature.com/articles/s41467-023-36074-2 https://www.nature.com/articles/s41467-023-36074-2