A four-point logistic curve (Equation (1)). 𝑌=𝑑+(𝑎−𝑑)1+(𝑥𝑐)𝑏Y=d+(a−d)1+(xc)b (1) where 𝑎a and 𝑑d are the upper and lower plateaus respectively, 𝑐c is the point of inflection and 𝑏b Hill’s slope was fit to the data to determine a ...