Jing,

It may depend on the file format. My experience with crystal formats is null. 
This is what I 
know from other formats:

If the file provides atom numbers (like PDB), Jmol will obey them. The 
atomIndex starts at 
zero, so it is usually atomNo minus one.

Otherwise, i guess that atoms are numbered in the order they are read from file.

One important difference is that atom numbers may be dupicated, e.g.  when 
several models 
are loaded (or a SDF or XYZ file that holds several models in one file). 
However, atom 
indexes are sequentiallly incremented across all models and so they are unique.

If the model is repeated to generate the crystal, that's more complex; others 
may be able to 
tell you.


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