Table 2.

Descriptive statistics of groups of peaks as revealed by hierarchical clustering

Categorization			Spearman correlation between peaks in the category
			N	Median	Mean	Minimum	Maximum	% < 0.1	% 0.1 to 0.5	% > 0.5
1	1	1	120	0.76	0.74	0.35	0.99	0.0	8.3	91.7
		2	153	0.44	0.44	0.02	0.83	0.0	60.1	39.9
2	2	3	120	0.34	0.34	-0.14	0.94	0.0	50.1	33.2
		4	378	0.26	0.28	-0.26	0.92	5.6	74.6	19.8
	3	5	210	0.43	0.38	-0.29	0.96	5.2	57.6	37.1
		6	465	0.29	0.28	-0.42	0.90	11.0	68.0	21.1

% < 0.1, percentage of correlations with value smaller than 0.1; % 0.1 to 0.5, percentage of correlations in the interval 0.1 to 0.5; % > 0.5, percentage of correlations with values greater than 0.5. Categories are ordered according to decreasing minimal correlation in the group. N, number of correlations between peaks in the category: N = (number of peaks in the category² - number of peaks in the category)/2).