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Table 1

Definition of variogram models and their associated parameters

Modelγ(h)Range of h
1. Spherical
model 
 0 < ha 
h > a 
2. Exponential model  h > 0 
3. Gaussian model  h > 0 
4. Nugget model h = 0 
h > 0 
5. Cubic model  0 < ha 
h > a 
6. Circular model  0 < ha 
h > a 
7. Pentaspherical
model 
 0 < ha 
h > a 
Modelγ(h)Range of h
1. Spherical
model 
 0 < ha 
h > a 
2. Exponential model  h > 0 
3. Gaussian model  h > 0 
4. Nugget model h = 0 
h > 0 
5. Cubic model  0 < ha 
h > a 
6. Circular model  0 < ha 
h > a 
7. Pentaspherical
model 
 0 < ha 
h > a 

c and a denote the sill and influence ranges, and h the distance (Davis 1973).

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