Curve Fit
                                                        
                                                    
Replace a section of a contour between 2 points by fitting a curve to the contour path.
                                                        
                                                    
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Activate the Curve Fit command.
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Click to place the first point
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Click to place the second point
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A pink preview of the new segment will appear. Drag the two points to change the contour section that will be approximated.
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Press Enter to accept the change