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By using a lower symmetry than the molecule has there might be several equal
symmetry planes possible to use as main symmetry plane.
IOP(2/20) is needed to define which one is the main symmetry plane.

IOp(2/19)
Largest allowed point group, as Hollerith string.

IOp(2/20)
Number (1-3 for X-Z) of axis to help specify which subgroup of the type specified in IOp(19) to use.

[ Last edited by yytsnake on 2009-10-8 at 17:45 ]
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