:term:`DENOMINATOR_DELTA <DENOMINATOR_DELTA (SAPT)>`
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      Maximum error allowed (Max error norm in Delta tensor) in the approximate energy denominators employed for most of the :math:`E_{disp}^{(20)}` and :math:`E_{exch-disp}^{(20)}` evaluation.

      * **Type**: double
      * **Default**: 1.0e-6