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Effect of speed conditions on the average aperture opening distance (open area) and closure distance (dotted area) (a, b), on the average aperture opening time (open area) and closure time (dotted area) (c, d), and on the average normalized aperture opening time (e, f). Panels a, c, and e represent the near target conditions, and b, d, and f represent the far target conditions. The error bars indicate the standard errors
