Fig. 1From: Performance of alternative spatial models in empirical Douglas-fir and simulated datasetsEmpirical semivariograms of residuals from the bidimensional separable first-order autoregressive (AR) and bidimensional spline regression (splines) models fitted to a simulated dataset with a high-variance short-ranged AR spatial effect under a single-tree plot structure. The horizontal (darker) lines are the estimated values of the residual variances for a true value of 1Back to article page