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Fig. 7. Breaking strain (
brk) as a function of fractional distance
(d) along the feather, where `0' represents the proximal end and `1'
represents the distal end of the feather. There were no significant
differences in slope (P2,153=0.78) or intercept
(P2,153=0.52) for each barb color (overall equation:
brk=-0.036d+0.079, r2=0.19,
P1,154<0.001 that the overall slope is zero).