:term:`WFN_TYPE <WFN_TYPE (DFOCC)>`
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      Type of the wavefunction.

      * **Type**: string
      * **Possible Values**: DF-OMP2, DF-OMP3, DF-OCEPA(0), DF-OMP2.5, DFGRAD, CD-OMP2
      * **Default**: DF-OMP2

