JEB -- Doucet et al. 209 (2): 380 Figure IG1

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Fig. 1. Schematic representation of measurement geometries. Angles of incident ( ${theta}$ _i) and reflected ( ${theta}$ _r) light increase when moving away from a plane perpendicular to the reflective surface and are always equivalent. Reflectance measurements were taken at incident light angles of 0° (perpendicular to the feather surface) except where otherwise indicated.