N

As

Pb

Cd

Cr

Cu

Zn

Hg

Lower

+0.5

−0.736

−0.866

−0.5

+0.866

−0.075

+0.5

Lower middle

+0.970

+0.956

−0.681

−0.831

−0.681

+0.955

+0.681

Middle

+0.101

+0.164

+0.619

+0.084

+1^*

+0.187

−0.5

High

+0.404

+0.414

+0.784

−1^*

+0.757

−0.027

+0.328