:term:`CFOUR_DIFF_TYPE <CFOUR_DIFF_TYPE (CFOUR)>`
"""""""""""""""""""""""""""""""""""""""""""""""""

      Specifies whether orbital-relaxed (RELAXED =0) or orbital-unrelaxed (UNRELAXED =1) derivatives are computed in the CC calculation.

      * **Type**: string
      * **Possible Values**: RELAXED, UNRELAXED
      * **Default**: RELAXED

