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INTERNATIONAL TABLES for CRYSTALLOGRAPHY |
Volume G |
Definition and Exchange of Crystallographic Data |
Definition:
A description of special aspects of the weighting scheme used in least-squares refinement. Used to describe the weighting when the value of _refine.ls_weighting_scheme is specified as 'calc'.Example:
; Sigdel model of Konnert-Hendrickson:
Sigdel =
Afsig + Bfsig*(sin(theta)/lambda-1/6)
Afsig = 22.0, Bfsig = 150.0
at the beginning of refinement.
Afsig = 16.0, Bfsig = 60.0
at the end of refinement.
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Type: text
Mandatory item: no
Alias:Category: refine
Copyright © 2005 International Union of Crystallography