No, in my case it was a theoretical work, but others have measured it e.g. https://www.nature.com/articles/s41586-020-1989-2 https://www.nature.com/articles/s41

No, in my case it was a theoretical work, but others have measured it e.g. https://www.nature.com/articles/s41586-020-1989-2 https://www.nature.com/articles/s41586-020-1989-2