JEB -- Butler and Johnson 207 (2): 285 Figure IG4

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Fig. 4. Breaking stress ( ${sigma}$ _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 (ANCOVA; P_2,153=0.17) or intercept (P_2,153=0.09) between barb colors (overall equation: ${sigma}$ _brk=-79d+320, r²=0.09, P_1,154<0.001 that the overall slope is zero).