:term:`MPN_ORDER_SAVE <MPN_ORDER_SAVE (DETCI)>`
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      If 0, save the MPn energy; if 1, save the MP(2n-1) energy (if available from :term:`MPN_WIGNER <MPN_WIGNER (DETCI)>` = true); if 2, save the MP(2n-2) energy (if available from :term:`MPN_WIGNER <MPN_WIGNER (DETCI)>` = true). 

      * **Type**: integer
      * **Default**: 0