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. Author manuscript; available in PMC: 2012 Mar 29.
Published in final edited form as: J Opt Soc Am A Opt Image Sci Vis. 2012 Feb 1;29(2):A188–A193. doi: 10.1364/JOSAA.29.00A188

Fig. 2.

Fig. 2

CFF measurements as a function of surround illuminance for observers (top) J. S., (center) Y. L., and (bottom) I. V. (Left) 2 Td center, (middle) 20 Td center, (right) 200 Td center. The arrows indicate the center illuminance. The error bars are standard errors of the means. The majority of error bars are absent because they are covered by the plot symbols.