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Angles are in degrees.
Since there are three angles for each triangle in the mound configuration and also in the ideal pentad, there are six lines altogether. However, the ideal and measured angles are so close that there appear to be effectively just three lines. The close overlap of the lines for the ideal angles and the lines representing the measured angles indicates the closeness of fit between the ideal and measured figures. Within measurement error, the mounds are clearly distributed according to the ideal configuration. According to Dr. Crater's calculations, the chances of this close fit occurring at random are less than one in two hundred million.