Andy C. answered 11/01/17
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P = k/w^2 where P is the pressure , w is the heel width, and k is a fixed number constant.
400 kPa = k/2^2
400 = k/4
k = 1600
The official formula is P = 1600/w^2
P(w) = 1600/w^2 = 1600*w^(-2)