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How do you create a parabolic function in the formula editor

I'm trying to make a power ramp up and down function for a stepper motor.  I want to use a parabolic function.  The only problem is the motor cannot exceed a certain speed.  In other words I need to have an upper and lower limit also associated with this. 
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Put a Scaling module after the formula, and use it to limit the upper and lower range.
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