Table 2.

Abundances based upon Diff category

Group	Diff	Frequency	%	Cumulative %
1	(−2)–(−1)	1	0.6	0.6
2	(−1)–0	19	12.0	12.6
3	0–1	60	38.0	50.6
4	1–2	50	31.6	82.3
5	2<	28	17.7	100.0
	Total	158	100.0