Fig. 2.

(A) Front speed estimation for the Neolithic farmer (Upper) and Yamnaya steppe peoples (Lower) population movements. We used an RMA regression on time against distance from the hypothesized origin of the spread to estimate average migration front speed. In this case, we used a $>50\%$ ancestry cutoff to define genomes as belonging to a particular migration wave. Est., estimated. (B) Point-of-origin estimation. We computed the correlation coefficient between time of sampling and distance from a hypothesized origin, which should be negative for a range expansion. Each dot in the map represents a different hypothesized origin.