English: Uncorrected absorbances of visual pigments of birds (alternative to File:Tetrachromaticpigments01.png) based on Pryke, Sarah R. (2007) Sexual selection of Ultraviolet and structural color signals in Reproductive biology and phylogeny of birds/volume 6a-6b edited by Barrie G.M. Jamieson. pages 1-40. This book cites Hart NS, Partridge JC, Bennett ATD and Cuthill IC (2000) Visual pigments, cone oil droplets and ocular media in four species of estrildid finch. Journal of Comparative Physiology A186 (7-8): 681-694 for the data, curve fits, and method; online here.
Русский: Четыре типа пигментации колбочек птиц (в данном примере это вьюрковые ткачики) расширяют цветовой диапазон их видения до области ультрафиолета.
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Replace poorly-aligned spectrum with carefully aligned spectrum from https://upload.wikimedia.org/wikipedia/commons/d/d9/Linear_visible_spectrum.svg Also straighten axes, line up marks, and make axis label not stretched
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