Fig. 3From: Comparison of models for estimating bark thickness of Picea abies in southwest Germany: the role of tree, stand, and environmental factorsEstimated smooth functions describing the partial effect of the five covariates on double bark thickness (DBT): a) the smooth of diameter outside bark, (b) the smooth of dbh outside bark, (c) the smooth of tree height, (d) the smooth of relative tree height, and (e) the smooth of age. Shaded areas are 95%-confidence intervalsBack to article page