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(You may want to print this page for reference during the experiment).

At the start of each trial, the comparison line will be located either at the true connection point, above the true connection point, or below the true connection point. Your task is to decide if the comparison line is above or below this point. For example, the picture below shows a comparison line well above the true connection point. In this case, you would press the Above button. In the case where the comparison and standard lines appear to be collinear, just randomly choose a button, either the Above button or the Below button.