Dear List,

The following formula is given for a spherical model in variofit (geoR).

/rho(h) = 1 - 1.5 * (h/phi) + 0.5(h/phi)^3 if h < phi , 0 otherwise

/Could anyone explain what the term "if h<phi, 0 otherwise" means? Which 
part of the equation becomes 0 if h>phi?
And shouldn't there be a * between 0.5 and (h/phi)?

Thanks in advance,
Anna

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