:term:`SAPT_SS_SCALE <SAPT_SS_SCALE (SAPT)>`
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      The scale factor used for same-spin pairs in SCS computations. SS/OS decomposition performed for :math:`E_{disp}^{(20)}` and :math:`E_{exch-disp}^{(20)}` terms.

      * **Type**: double
      * **Default**: 1.0/3.0