You probably know this, but for the benifit of others who may be reading this thread, the first value in a falloffCpt line is the distance from the center of the Zone as a percentage of the redius where "1" is equal to 100%, and the second value is the strength of the Mag at that point with "1" being full strength.

You can have as many falloffCpt (Control Point) lines as you want, but there should be a minimum of two.