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(a) Single reflectance spectra of the red back feathers of E. ruber (YPM 26570), the red–orange belly feathers of a male P. rubra (YPM 7362) and the purple breast feathers of male I. isabellae (YPM 77812); (b) Optical absorption spectra of the feathers computed from the reflectance spectra using A = −log (R), where R = reflectance.
