From: Spatial heterogeneity analysis and source identification of heavy metals in soil: a case study of Chongqing, Southwest China
Element
Theoretical model
C0
C+C0
C0/(C+C0)
A(m)
R2
Residuals
As
Gaussian
0.023
0.230
0.100
62.400
0.988
1.200E-04
Cu
Exponential
0.066
0.150
0.437
2523.000
0.921
1.642E-04
Mn
0.0001
0.088
0.001
57.200
1.572E-04