JEB -- Butler and Johnson 207 (2): 285 Figure IG7

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Fig. 7. Breaking strain ( ${epsilon}$ _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 (P_2,153=0.78) or intercept (P_2,153=0.52) for each barb color (overall equation: ${epsilon}$ _brk=-0.036d+0.079, r²=0.19, P_1,154<0.001 that the overall slope is zero).