Fig. 4From: Comparison of models for estimating bark thickness of Picea abies in southwest Germany: the role of tree, stand, and environmental factorsContour plot showing estimated double bark thickness in millimetres over age and breast height diameter outside bark (dbhob). Covariates that were included in the model but are not shown were set to the median of occurring values in the data. Shaded area approximately covers the region that was covered by observationsBack to article page