This graph shows the results of the experiment. The dashed lines show the thresholds when just one of the tone (1st or 2nd) is presented; the solid curve shows thresholds when the tones are presented in sequence. On the x-axis is the level of the noise between the tones in the three conditions. Thresholds were better when there were two tones instead of one, and the level of the noise doesnŐt make much difference. This result supports the multiple looks theory and argues against the multiple integrators theory,