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34 The PCB Magazine • March 2014 The Weibull distributions shown in Figure 9 are well formed. When reviewed together with the 95% confidence contours (CC)s dis- played in Figure 10 they clearly define a statis- tical difference between the sample lots. Based on these distributions there is a 13% reduction in survivable strain associated with the forced rework of this laminate material. Apparently, SPHERICAL BEND TESTING continues Figure 9: weibull distributions for thermal excursion lots. Figure 10: 95%cc for thermal excursion distributions.