Part V
Simplifying Structural Models

24 Overview: Simplifying Models
25 Constraints
25.1 GSAS-II Parameter Naming
25.2 GSAS-II Constraint Types
25.3 Constraint and New Variable Processing
25.4 Typical Constraint Use
26 Restraints
26.1 Bond Distance Restraints
26.2 Angle Restraints
26.3 Plane Restraints
26.4 Chiral Restraints
26.5 Chemical Composition Restraints
26.6 Magnetic Moment Restraints
26.7 General Restraints
26.8 Choosing the Restraint Weighting
26.9 Testing Restraints
26.10 Restraints not provided by GSAS-II
27 Rigid Body Constraints
27.1 Vector Rigid Bodies
27.2 Residue Rigid Bodies
27.3 Rigid Body Axes and Origin
27.4 Defining Residue Rigid Body Examples
27.5 Inserting Rigid Bodies
27.6 Orienting Rigid Bodies: Quaternions
27.7 Rigid Bodies and Crystallographic Symmetry
27.8 Example: Inserting rigid bodies
27.9 TLS Displacement Parameters for Rigid Bodies