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Illustration of the images of the digits and the interval fixation cross in the 2D (a–c) and 3D (d–f) conditions. In the 3D condition, the digits (d,f) and the interval fixation cross (e) both possessed a crossed disparity of 0.6 arc deg. In the 2D condition, the profiles of the digits and the interval fixation cross were outlined with fine black line. The square as explained in section 5.2 is indicated by the red dashed box.
