:term:`BENDAZZOLI <BENDAZZOLI (DETCI)>`
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      Do use some routines based on the papers of Bendazzoli et al. to calculate sigma? Seems to be slower and not worthwhile; may disappear eventually. Works only for full CI and I don't remember if I could see how their clever scheme might be extended to RAS in general. 

      * **Type**: :ref:`boolean <op_c_boolean>`
      * **Default**: false