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# GAUGE

> Specifies the choice of representation of the electric dipole operator. Acceptable values are `LENGTH` for the usual length-gauge representation, `VELOCITY` for the modified velocity-gauge representation in which the static-limit optical rotation tensor is subtracted from the frequency- dependent tensor, or `BOTH`. Note that, for optical rotation calculations, only the choices of `VELOCITY` or `BOTH` will yield origin-independent results.

> - Type: string
> - Possible Values: LENGTH, VELOCITY, BOTH
> - Default: LENGTH

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