Fig. 5From: Two new methods applied to crown width additive models: a case study for three tree species in Northeastern ChinaPartial residual plots of covariables to each CR for a larch, b birch, and c poplar. The solid line in each plot is the estimate of the smooth function, while the dashed lines are roughly 95% confidence limits. At the base of each plot is a univariate histogram (rugplot) showing the distribution of data pointsBack to article page