Figure 5.

(a) Plot of N _C values resulting from the criterion in equation (8) for selected choices of c (3 ≤ c ≤ 6) versus the N _C values determined by inspection of the N _RCN(R) curves. (b) Variation in average and skewness of N_C deviations for N_C values determined according to equation (8) relative to N_C values determined visually from the N _RCN(R) curves depending on the choice of the coefficient c. Both graphs refer to the analysis of the 64 cases mentioned in the text, where the proposed value of N _C is sensitive to the choice of c, while the visual inspection appeared unambiguous.