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(a)–(e) standards, (f) comparison. (a) horizontal, (b) vertical, (c) zigzag, (d) check, (e) plain, (f) 1-D Gaussian. Stimuli (a)–(d) were displayed at two contrast levels (6.25% and 100%); stimulus (e) was displayed at maximum luminance (95.4 cd/m2); stimulus (f) ranged from mean luminance (47.7 m2) to maximum luminance (95.4 cd/m2).
