Table 1 For each type of test event, and for each of the mRFS, WSC, RFS, and PCA methods, we list the total number of scatterplots (on the denominator) and the number of plots that show four clear clusters (on the numerator)

2SD

0/16

0/496

0/496

0/496

3SD

3/16

3/496

0/496

0/496

(1 vs. 3, 0.61)

(8 vs. 22, 0.59)

(1 vs. 1, 0.59)

(10 vs. 22, 0.58)

(3 vs. 2, 0.57)

(8 vs. 21, 0.57)

4SD

9/16

7/496

3/496

0/496

(1 vs. 3, 0.81)

(10 vs. 22, 0.80)

(17 vs. 19, 0.77)

(1 vs. 1, 0.80)

(10 vs. 21, 0.79)

(17 vs. 18, 0.55)

(3 vs. 2, 0.79)

(8 vs. 9, 0.78)

(17 vs. 20, 0.52)

(2 vs. 2, 0.78)

(9 vs. 11, 0.77)

(0 vs. 3, 0.71)

(8 vs. 21, 0.76)

(0 vs. 1, 0.66)

(8 vs. 22, 0.76)

(2 vs. 0, 0.62)

(9 vs. 21, 0.72)

(1 vs. 2, 0.59)

(3 vs. 0, 0.51)