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Raw data plots showing horizontal and vertical positions of the left eye for the custom-built eye tracker and EyeLink 1000 Plus. Blue line – custom-built eye tracker; orange line – EyeLink 1000 Plus, dashed black line – the actual position of the fixation point at the time of the experiment. Both eye trackers largely agreed, but there were subtle differences in reported fixation position. Subsequent figures explore the reasons for such subtle differences.
