:term:`MRCC_LEVEL <MRCC_LEVEL (MRCC)>`
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      Maximum excitation level. This is used ONLY if it is explicity set by the user. Single-reference case: all excitations up to this level are included, e.g., 2 for CCSD, 3 for CCSDT, 4 for CCSDTQ, etc. This becomes ``ex.lev`` (option \#1) in fort.56.

      * **Type**: integer
      * **Default**: 2

