−2
0
2
4
6
8
10
−4
−2
0
2
4
6
Scores on PC 1 − 62.4 %
Scores on PC 2 − 16.4 %
−0.5
0
0.5
1
−0.5
0
0.5
1
C1
C2
C3
C4
C5
a375
DOC
TDN
TDP
DON
DOP
Loadings on PC 1 − 62.4 %
Loadings PC 2 − 16.4 %
i
−4
−2
0
2
4
6
−2
0
2
4
Scores on PC 2 − 16.4 %
Scores on PC 3 − 7.6 %
−0.5
0
0.5
1
−1
−0.5
0
0.5
1
C1
C2
C3
C4
C5
a375
DOC
TDN
TDP
DON
DOP
Loadings on PC 2 − 16.4 %
Loadings PC 3 − 7.6 %
ii
−4
−2
0
2
4
6
−2
0
2
4
Scores on PC 2 − 16.4 %
Scores on PC 4 − 6.1 %
−0.5
0
0.5
1
−1
−0.5
0
0.5
1
C1
C2
C3
C4
C5
a375
DOC
TDN
TDP
DON
DOP
Loadings on PC 2 − 16.4 %
Loadings PC 4 − 6.1 %
iii
(a)
(b)
(c)
Plate 17. Principal components analysis of PARAFAC components and water quality parameters for
the Horsens catchment data set. Score plots (a–c) showing variation among sites are on the left, loading plots (i–iii) showing correlations between measured variables are on the right.