:term:`CFOUR_MEM_UNIT <CFOUR_MEM_UNIT (CFOUR)>`
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      Specifies the units in which the amount of requested core memory is given. Possible choices are INTEGERWORDS (default), kB, MB, GB, and TB. **PSI4 Interface:** Keyword set from memory input command when given, always MB.

      * **Type**: string
      * **Possible Values**: INTEGERWORDS, KB, MB, GB, TB
      * **Default**: INTEGERWORDS

