Modify the regression data for alignment entities that were created by best fit.
The regression data can be modified, and then applied to the entity. If the entity is grip edited, it can be re-synchronized with the original regression data.
The Regression Data vista displays the source regression data from which the best fit entity was created. The regression data can be modified either before or after the entity has been created. The information in the Regression Data vista can be changed, and then applied to the entity. If the entity parameters are changed outside the Regression Data vista, the entity can be synchronized to the current regression data.
The Alignment Entities vista displays a form that is like a spread sheet, where each row represents an alignment entity and each column represents a parameter. When an entity is created by best fit, Best Fit is displayed in the Constraint2 column. Click 
in this column to edit the source regression data.
Regression data is not dynamically linked to the best fit entity. If the entity is edited, 
appears in both the Regression Data and Alignment Entities vistas.
Editing Floating Best Fit Entities
The manner in which a best fit floating entity reacts to edits to the attachment entity depends on whether the best fit entity is synchronized with the best fit sample data:
- If the floating best fit entity is synchronized with the best fit sample data, it will maintain tangency when the attachment entity is edited. The floating best fit entity geometry will change to adapt to changes to the attachment entity, and continue to honor the regression points.
- If the floating best fit entity is not synchronized with the best fit sample data, it will behave as a normal floating entity. The floating best fit entity will remain tangent to the attachment entity, and its geometry will not change to honor the regression points.