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Results of Experiment 3 in the surface-slant judgment measurement (n=8). Overall, the far checkerboard-textured surface had to be slanted downward for it to be perceived as coplanar with the near checkerboard-textured surface (filled diamonds). The derived, predicted slant errors, based on the judged distance (d) and the equation, d=d1+d2*sin(α)/sin(α+η), are plotted as the open circles. There is no significant difference in the magnitudes of the judged and predicted slant errors.
