^*Atom names start with element symbolsright-justified in columns 13-14 as permitted by the length of the name.For example, the symbol FE for iron appears in columns 13-14, whereas the symbol C for carbon appears in column 14(see Misaligned Atom Names).If an atom name has four characters, however, it must start in column13 even if the element symbol is a single character(for example, see Hydrogen Atoms).

https://www.cgl.ucsf.edu/chimera/docs/UsersGuide/tutorials/pdbintro.html

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