there is a distance beyond which there are no more geographic surprises, this distance is known as the range , and the value that the semivariogram model attains at the range is called the sill .
SILL
Meaning of SILL in English
Sean Woo's Finance, GIS and real estate English glossary. Английский глоссарий по ГИС(Географическая информационная система) и недвижимости Sean Woo's Finance. 2012