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Bispectra of (a) inclination of the earth’s orbit, (b) δ18O data from Specmap, and (c) the eccentricity of the earth’s orbit. The inclination and eccentricity were taken from Quinn et al. (5) transformed to the invariable plane. Note the close match between the most significant peaks in the inclination bispectrum and δ18O bispectrum. The scale is linear, and the units arbitrary; for details of the bispectral method see MacDonald and Muller (26).
