Number of high-delta SNPs and regions represented by TA/EX values for the Yoruba-Han comparison. (a) The female proportion of the effective population size and the female proportion of migration were both varied over a range from 0.01 to 0.99. For each of the 9,800 possible pairs of these values, a list of TA/EX values was produced from the observed autosomal delta values for the Yoruba-Han. The color at a given point on the grid represents the number of high-delta SNPs out of 640,698 total SNPs found in this list. (b) The same as in (a), except that the color at a given point on the grid signifies the number of high-delta regions out of 13,395 total regions represented by each list of TA/EX delta values.