The Weibull distribution was generally the most suitable model for describing the maximum diameters of B. pubescens, P. pinaster, P. radiata and P. sylvestris. However, it is a much more complex model than the Gumbel distribution, and iterative procedures must be used in the method of moments fits. The Gumbel distribution fitted by the moments method also
yielded good results for maximum diameters (see Fig. 1), although this is a simpler and thus less flexible model.