:term:`EFP_DISP_DAMPING <EFP_DISP_DAMPING (EFP)>`
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      Fragment-fragment dispersion damping type. ``TT`` is a damping formula by Tang and Toennies. ``OVERLAP`` is overlap-based dispersion damping.

      * **Type**: string
      * **Possible Values**: TT, OVERLAP, OFF
      * **Default**: OVERLAP