                 let ½DeltaX = deltaX / 2.0
                 let ½DeltaY = deltaY / 2.0
                 
-                let xRadius² = xRadius*xRadius
-                let yRadius² = yRadius*yRadius
+                var xRadius² = xRadius*xRadius
+                var yRadius² = yRadius*yRadius
                 
                 
                 // steps are from the implementation notes

                {
                    xRadius *= sqrt(shouldBeNoMoreThanOne)
                    yRadius *= sqrt(shouldBeNoMoreThanOne)
                    
                    shouldBeNoMoreThanOne = translatedCurPointX²/(xRadius²)
                        + translatedCurPointY²/(yRadius²)

  //
//  CGPath+SVG.swift
//  Scalar2D
//
