:term:`DMRG_IRREP <DMRG_IRREP (DMRG)>`
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      The DMRG wavefunction irrep uses the same conventions as PSI4. How convenient :-). Just to avoid confusion, it's copied here. It can also be found on http://sebwouters.github.io/CheMPS2/doxygen/classCheMPS2_1_1Irreps.html . Symmetry Conventions Irrep Number & Name Group Number & Name 0 1 2 3 4 5 6 7 0: c1 A 1: ci Ag Au 2: c2 A B 3: cs A' A'' 4: d2 A B1 B2 B3 5: c2v A1 A2 B1 B2 6: c2h Ag Bg Au Bu 7: d2h Ag B1g B2g B3g Au B1u B2u B3u

      * **Type**: integer
      * **Default**: -1

