This plot shows the correlation confidence level, in percent, for the lateral correlation of the estimated splitting functions of (l,l-1) pairs of splitting functions along this branch. A seperate line is shown for correlations at each (even) structural degree. Correlations with confidence less than 60% are not meaningful, and not shown. Confidence levels for lateral correlations are discussed in the paper "Correlations Between Global Features of Terrestrial Fields" [Mathematical Geology, 16, 155-171, 1984], by D.H. Eckhardt.