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Parameters for conserved quantities
-----------------------------------

*  ``nelec``

   **Type :** Positive integer

   **Description :** The number of valence electrons is specified with
   this parameter. When model = ``"Fermion HubbardGC"``, ``"Spin"``, or
   ``"SpinGC"``, it should not be specified.

*  ``2Sz``

   **Type :** Integer

   **Description :** The :math:`z` component of the twofold total spin
   is specified with this parameter. When
   model = ``"Fermion HubbardGC"`` or ``"SpinGC"``, it should not be
   specified.

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