Practical range
= Practical range
{title2=$h_{0.95}$}
A practical range specifies a distance at which a chosen fraction of the structured sill is reached. For the <Gaussian semivariogram> $\sigma^2(1-e^{-(h/a)^2})$, the 95-percent practical range is $a\sqrt{\log20}$, obtained by solving $e^{-(h/a)^2}=0.05$.