Fig 2.

Fig 2. The top image is a magnified view of the CMB centered on the Cold Spot. The color corresponds to temperature. The bottom image is a K-map, which depicts the randomness in temperature of the same region. The color corresponds to randomness, with blue being low-randomness and red being high-randomness. The white dot in the center symbolizes the center of the Cold Spot. You can see that the center lies in a low-randomness region surrounded by shell of high-randomness, a characteristic common to voids.

Link: http://www.yerphi.am/index.php/info-from-director/166-to-the-center-of-the-cold-spot