Fig. 8. The cumulative probability distribution of shell clamping as a proportion of the lift force for 38 individuals of the limpet Cellana tramoserica. Each limpet consistently clamped at a given proportion of the lift force. The figure shows the variation in the proportional response among individuals. The curve is described by P(x)=exp{–[(a–bx)/(a–bc)]^1/b}, where a=0.1241345, b=0.2015748 and c=0.08828305.