Use the Regression Data and Profile Elements vistas to edit parameters of profile elements that were created by best fit.
The Regression Data vista displays the source regression data from which the best fit element was created. The regression data can be modified either before or after the element has been created. The information in the Regression Data vista can be changed, and then applied to the element. If the element parameters are changed outside the Regression Data vista, the element can be synchronized to the current regression data.
The Profile Elements vista displays a form that is like a spread sheet, where each row represents a profile element and each column represents a parameter. When an element 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 element. If the element is edited, 
appears in both the Regression Data and Profile Elements vistas.
Editing Floating Best Fit Elements
The manner in which a best fit floating element reacts to edits to the attachment element depends on whether the best fit element is synchronized with the best fit sample data.
- If the floating best fit element is synchronized with the best fit sample data, it maintains tangency when the attachment element is edited. The floating best fit element geometry changes to adapt to changes to the attachment element, and continue to honor the regression points.
- If the floating best fit element is not synchronized with the best fit sample data, it behaves as a normal floating element. The floating best fit element remains straight to the attachment element, and its geometry will not change to honor the regression points.