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Reanalysis of Lich's [24] data reporting the population averages for the length and the width of the first lower molar (M1) in the C. primus fossil time series (Middle–Upper Pleistocene) from North America. The ordinary least-squares estimate of the evolutionary allometric slope (dotted line) is be = 0.94 ± s.e. 0.15 (R2 = 0.82).
