Fig. 5From: Stem taper function for sweet chestnut (Castanea sativa Mill.) coppice stands in northwest SpainBias (a) and root mean square error (RMSE) evolution (b) for diameter (cm) by relative height class (percentages) for the compatible system of Fang et al. (2000) and the non-compatible taper function of Kozak (2004)Back to article page