Top left: member index defined in Eq. (19) vs. contamination index. Top right: same MI vs. CI plot except using the membership probabilities given by the random assignment algorithm. Bottom left: member index defined in Eq. (20) vs. contamination index. Bottom right: same MI vs. CI plot except using the membership probabilities given by the random assignment algorithm. Linear fits in each plot shown as dashed black lines. Sizes, shapes, and colors as in Fig. 12.