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(a) Velocity threshold for fixation onset. (b) Velocity threshold for fixation offset. The error bars in panels A and B denote standard errors of the means. (c) Velocity thresholds for fixation offset versus fixation onset. Each point represents the data of one coder. The velocity thresholds for D.N., T.C., R.H., and I.H. are much higher than those for the other coders
