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(A) Maximum contraction amplitude (%) for the four first rod-weighted weak blue-light stimuli (mean, SEM; n = 44) in winter (dark blue symbols, solid line) and summer (light blue symbols, dashed line). (B) Maximum contraction amplitude (%) for cone-weighted bright red-light stimuli (mean, SEM) in winter (red symbols, solid line) and summer (pink symbols; dashed line; n = 46).
