:term:`FILTER_GUESS_SIGN <FILTER_GUESS_SIGN (DETCI)>`
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      The required phase (1 or -1) between the two determinants specified by :term:`FILTER_GUESS_DET1 <FILTER_GUESS_DET1 (DETCI)>` and :term:`FILTER_GUESS_DET2 <FILTER_GUESS_DET2 (DETCI)>`  

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

