Prior to the analysis, samples were arbitrarily classified as "orange" if the slowest rate contained > 25% of the total intensity. The remaining samples were classified as "blue" if the remaining intensity was >50% in the middle rate component, and "green" if the remaining intensity was > 50% in the fastest component. Example relaxation rate distributions and decay curves are shown in Figure . The decay curves were processed using OBP, and dot plots of pairs of parameter values were constructed and colored according to the classification. Even without employing sophisticated classification methods, it is evident from Figure that the unsupervised OBP treatment can successfully classify most samples.