Distributions and Sources of Sedimentary Sterols as well as Their Indications of Sewage Contamination in the Guanting Reservoir, Beijing

Table 7

Principal component analysis interpretation variables of sterols in sediments of the Guanting Reservoir.

Component	Initial eigenvalue			Extracting squares sum			Rotating squares sum
	Sum	Variance %	Accumulation %	Sum	Variance %	Accumulation %	Sum	Variance %	Accumulation %
1	4.064	58.05	58.05	4.064	58.05	58.05	2.312	33.03	33.03
2	1.302	18.60	76.65	1.302	18.60	76.65	2.228	31.83	64.86
3	1.072	15.32	91.97	1.072	15.32	91.97	1.897	27.11	91.97
4	0.323	4.62	96.59
5	0.160	2.29	98.88
6	0.060	0.86	99.74
7	0.020	0.26	100.00