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Fig. 4. Intensity reduction is more dissimilar from the average intensity reduction when plotted against time, than against distance. Equal dissimilarity would result in a slope of 1. Dissimilarity from average intensity reduction over time (x-axis) is plotted against dissimilarity from average intensity reduction over distance (y-axis), and the units of both are % dissimilarity from slope of the average linear regression line of reduction against time and distance, respectively.