I think it’s a combination of atomic radius and Z contrast (heavier atoms show differently from lighter ones in the TEM). It also helps that the crystal structu

I think it’s a combination of atomic radius and Z contrast (heavier atoms show differently from lighter ones in the TEM). It also helps that the crystal structure is known They also describe some comparison to forward modeling in the methods section, which is cool https://pubs.acs.org/doi/suppl/10.1021/jacs.0c12100/suppl_file/ja0c12100_si_001.pdf https://pubs.acs.org/doi/suppl/10.1021/jacs.0c12100/suppl_fi...