:term:`DF_BASIS_SAPT <DF_BASIS_SAPT (SAPT)>`
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      Auxiliary basis set for SAPT density fitting computations. :ref:`Defaults <apdx:basisFamily>` to a RI basis.

      * **Type**: string
      * **Possible Values**: :ref:`basis string <apdx:basisElement>`
      * **Default**: No Default