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Table 4 Parameters of pennula (hook radiates)

From: Morphometric characterisation of wing feathers of the barn owl Tyto alba pratincola and the pigeon Columba livia

Tyto alba p10   s8   gpc1  
  outer vane inner vane outer vane inner vane outer vane inner vane
density of pennula/mm2 a 73.5 99.8 82.3 100.2 79.1 91.5
mean length of pennula [μm] b 601 +/- 57.5 1271 +/- 87.1 785 +/- 43.3 1017 +/- 55.8 799 +/- 67.3 1014 +/- 63.4
Columba livia p10   s8   gpc1  
  outer vane inner vane outer vane inner vane outer vane inner vane
density of pennula/mm2 a 84.8 152.5 114.1 109.5 154.5 135.1
mean length of pennula [μm] b 79 +/- 6.6 136 +/- 15.0 171 +/- 7.8 181 +/- 10.7 158 +/- 14.1 201 +/- 22.3
  1. a mean values, nb (p10: N = 50, s8, gpc1: N = 20) multiplied with nhr (p10 ov: N = 48; all other N = 64)
  2. b mean values with standard error of the mean, N = 16