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Table 2.

Summary of morphological measurements for the feather barbs

VariableMeans.d.s.e.m.
Cortical cross-sectional area (sc) (mm20.0045 0.0024 0.00019 
Medullary cross-sectional area (sm) (mm20.0041 0.0027 0.00022 
sm/sc (=ka0.87 0.17 0.014 
Thickness/mean radius (t/r̄0.39 0.057 0.0046 
Mean height (μm) 166 76.5 6.13 
Mean width (μm) 66.8 16.0 1.28 
VariableMeans.d.s.e.m.
Cortical cross-sectional area (sc) (mm20.0045 0.0024 0.00019 
Medullary cross-sectional area (sm) (mm20.0041 0.0027 0.00022 
sm/sc (=ka0.87 0.17 0.014 
Thickness/mean radius (t/r̄0.39 0.057 0.0046 
Mean height (μm) 166 76.5 6.13 
Mean width (μm) 66.8 16.0 1.28 

Data for unmelanized and melanized barbs are pooled. Thickness/mean radius ratio assumes that the barbs have a hypothetical hollow cylindrical shape. Height is in the dorso-ventral direction; width is in the lateral direction. N=156 for all measurements.

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