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Item _refine_analyze.Luzzati_sigma_a_free

Description

              The value of sigma~a~ used in constructing the Luzzati plot for
               the reflections treated as a test set during refinement.
               Details of the estimation of sigma~a~ can be specified
               in _refine_analyze.Luzzati_sigma_a_free_details.

               Ref:  Luzzati, V. (1952). Traitement statistique des erreurs
               dans la determination des structures cristallines. Acta
               Cryst. 5, 802-810.

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