Linear productivity (M)

Contrast

coefficient

PI

(NW)

PII

(Central)

PIII

(SE)

Ag

0.5

0.7

1.5

0.33

As

1077

31

217

4.96

Cr

41

91.5

43

0.95

Ni

33

54.5

22

1.5

Co

10.2

21

13.3

0.77

Cu

101.5

102

59.5

1.71

Zn

2322

111.5

286

8.12

Pb

2899.5

127

559

5.19

Total

6484.7

539.2

1201.3