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Menu:   Measure > Parameters  
Script:   SelectParam ("RBest")  

Select this parameter to compute the best fit radius of objects' boundaries. RBest is defined as the radius of the circle which fits the boundary points as close as possible (the sum of the squared distances between the points and the perimeter of the circle is minimized). In Angle Measurements this parameter defines the radius of the circle that precisely fits three selected points.

The parameter is calculated in calibrated units.