Numbers are an easy way to find any point on an L-Curve.
Estimates may come from a tool called a Bubble Diagram. The use of the initial Bubble Diagram was awkward. The diagram was improved into its present form by Mr. Lowell Jackson during an L-Curve course at the University of Wisconsin, Madison, Wisconsin. Since detailed logic of all these 12 diagrams is beyond this Web Site, one sample will be shown. This gives us another advantage.