JEB -- Hunt et al. 204 (14): 2499 Figure IG1

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Fig. 1. The proportional transmission (300–700nm) of the four filter-types: ultraviolet-blocking (UV-), short-wave-blocking (SW-), medium-wave-blocking (MW-) and long-wave-blocking (LW-). Each filter removes a portion of the bird visible spectrum, closely corresponding to the spectral sensitivity of one of the four zebra finch single cone types (see Bowmaker et al., 1997). Spectra are plotted in the colour that the filters appear to the human eye.