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Fig. 6. Toughness (T) 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=0.76) or intercept
(P2,153=0.22) between barb colors (overall equation:
T=-10d+15, r2=0.19,
P1,154<0.001 that the overall slope is zero).