:term:`CFOUR_UNITS <CFOUR_UNITS (CFOUR)>`
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      Specifies the units used for molecular geometry input. ANGSTROM (= 0) uses Angstrom units, BOHR (= 1) specifies atomic units. **Psi4 Interface:** Keyword set from active molecule, always ANGSTROM.

      * **Type**: string
      * **Possible Values**: ANGSTROM, BOHR
      * **Default**: ANGSTROM