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Nonsinusoidal cycle properties of eccentricity. (A) Orbital eccentricity (8), and (B) its skewness, (C) asymmetry, and (D) kurtosis, calculated across a 2-My sliding window using standard (turquoise circles) and bispectral methods (purple-pink triangles). An unexplained, small offset in skewness (A) is observed between values calculated using the standard and bispectral methods. Vertical gray bars are as in Fig. 1.
