Fig. 6From: Stem taper function for sweet chestnut (Castanea sativa Mill.) coppice stands in northwest SpainBias (a) and root mean square error (RMSE) evolution (b) for height (m) by relative diameter class (DBH class) for the compatible system of Fang et al. (2000) and the non-compatible taper function of Kozak (2004)Back to article page