Feathering of U-Points

Is there a way to control the feathering of U-Points, say within Color Efex Pro. I have an image that I’m trying to edit and using ‘Indian Summer’. I noticed that the effect feathers out from the circle. Supposed I wanted the effect to stop at the circle boundaries.

Thank you

You can add protective U-points - see here http://tuto.dxo.free.fr/EN/RegLocaux/Local_Adjustments.html#7_Le_Point_de_Controle