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Two cases of fit of root diameter spectrum using four types of function. Note the different graduation of the y-axis in (A) and (B). In this study, the maximum cumulative relative RID was set to 0·999 instead of 1·000, as we were not certain whether the maximum sampled root diameter class ]20, 50] mm was the maximum in reality. The log-normal and the Gompertz CDF achieved the best fit in (A) and (B), respectively.
