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Fig. 4. Breaking stress (
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; P2,153=0.17) or intercept
(P2,153=0.09) between barb colors (overall equation:
brk=-79d+320, r2=0.09,
P1,154<0.001 that the overall slope is zero).