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The top panels show example contrast—response functions for PC cells in three phenotypes. A, 556 nm dichromat; B, Δ7 nm trichromat; C, Δ20 nm trichromat. •, luminance modulation; ○, red—green chromatic modulation. The lower panels show response gain for the two stimulus conditions for PC cells in these phenotypes. D, 556 nm dichromat; E, Δ7 nm trichromat; F, Δ20 nm trichromat.
