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. Author manuscript; available in PMC: 2017 Feb 28.
Published in final edited form as: J Opt Soc Am A Opt Image Sci Vis. 2016 Mar;33(3):A104–A122. doi: 10.1364/JOSAA.33.00A104

Fig. 7.

Fig. 7

Mean log quantal sensitivity of S-, M-, and L-cone mechanisms plotted as a function of age. Data points represent two-color increment thresholds for individual observers. From [92].