:term:`DF_BASIS_ELST <DF_BASIS_ELST (SAPT)>`
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      Auxiliary basis set for SAPT Elst10 and Exch10 density fitting computations, may be important if heavier elements are involved. Defaults to BASIS-RI.

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