Fitted variogram models, total variance estimates (s2), variogram parameter estimates (c0, c1, and a), and other variogram relationships for each study location.

c0 is an estimate of the nugget effect and c0/s2 is an estimate of the fraction of the total variance represented by small-scale variability. The sum c0 + c1 is the sill, and a defines the rate and, in the case of the spherical and piecewise linear models, the range at which the sill is reached. For the exponential model, the range was estimated as the distance where the variogram model reached 95% of the sill. The maximum extent is the largest geographic distance between two sampling locations in a study.