:term:`DMRG_SCF_ACTIVE_SPACE <DMRG_SCF_ACTIVE_SPACE (DMRG)>`
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      Which active space to use for DMRG calculations: --> input with SCF rotations (INPUT); --> natural orbitals (NO); --> localized and ordered orbitals (LOC)

      * **Type**: string
      * **Possible Values**: INPUT, NO, LOC
      * **Default**: INPUT

