Fig. 5From: The influence of heartwood, sapwood and density on moisture fluctuations and crack formations of coated Norway spruce in outdoor exposureLinear regression model (Eq. 1, \({\text{MC}} = {\text{MC}}_{\text{mT}} + Xk + F\)) with a normalised linear coefficient (k) relative to the average MC of all replicates (MCmT). The error bars represent 95% of the values. A negative k value indicates that the variable X contributes to a lower MC relative to the MCmT. A–D: coating systems described in Table 2Back to article page