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Variation in pairwise migration rates with increasing distance between locations. (a) MMIG is the estimated long-term migration rate/mutation rate; a logarithmic curve (R2 shown) provided a better fit than a linear regression (R2 = 0.27). (b) mBAPS is the estimated recent migration rate; again, a linear regression provided a poorer fit (R2 = 0.29) than the fitted logarithmic curve.
