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

      * **Type**: double
      * **Default**: 6.0/5.0