Fig. 4

Comparison of observed and predicted percentages of above canopy light (PACL) for (a, b, c) direct and (d, e, f) diffuse radiation considering the “Radiation data only” optimization strategy for the “Ed,” “Bd” and “M” crown forms, using the turbid medium radiative transfer formulation. The star symbols represent individual observed PACL values for each considered measurement location as a function of corresponding median values for the distributions of PACL predictions obtained through the application to the model of 1 000 parameter sample sets drawn from the posterior distribution. The dashed lines represent the Deming regressions on these couples of values and the dot-dashed curves delimit the 95% confidence intervals to the regressions. The error bars are the 90% prediction credible intervals. The solid lines correspond to the 1:1 relationships