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IOp(2/16)
action taken if the point group changes during an optimization. IOP(2/16=0)Abort the job. IOP(2/16=1)Keep going. IOP(2/16=2)Keep going and leave symmetry on, using the old symmetry. IOP(2/16=3)Keep going and leave symmetry on, using the new symmetry

IOp(17)
Tolerance for distance comparisons in symmetry determination.
0  Default (determined in the symmetry package, currently 1.d-8).
N>0  10-N.
N<0 10N, use the same tolerance for orientation.

IOp(18)
Tolerance for non-distance comparisons in symmetry determination.
0  Default (determined in the symmetry package, currently 1.d-7).
N>0  10 -N.
N<0  10 N, use the same tolerance for orientation.

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