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Fig. 1. (A) Mean transmission spectra of ultraviolet-transmitting (UV+) and ultraviolet-blocking (UV-) filters used in experiment 1. (B) Mean transmission spectra of ultraviolet-blocking (UV-), short-wavelength blocking (SW-), medium-wavelength blocking (MW-) and long-wavelength blocking (LW-) filters used in experiment 2. (C) Reflectance spectra of red millet seeds, white millet seeds and their sand background used in experiments 1 and 2. Values are means ± S.E.M. (N=8 for all three means).