Dear R users, 

I am learning geostatistics and was trying to analyse the Wolfcamp-Aquifer data from Cressie's famous book (1994) using the geoR package. However I don't know how to fit the semivariogram model found by Cressie (4.1.2) page 217. It is a smooth combination of two power models. How can I do that with geoR ? Or gstat ? 

Thanks, 
Gildas 

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Gildas Mazo 
Doctorant Equipe-Projet MISTIS 
INRIA Grenoble Rhone-Alpes 
Inovallée, 655, av. de l'Europe, Montbonnot 
38334 Saint-Ismier Cedex France 
Bureau: G-206 
Tel: +33 (0) 4 56527104 

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