Fig. 3From: How imputation can mitigate SNP ascertainment BiasTrue HE vs. ascertained HE (a) and imputed HE (b) by population group. For the imputed case, the strategy of using the same number of reference samples per population (allPop_74_740) is shown, an increase in the number of reference samples per population (1–10) is marked by an increasing color gradient and the line of identity is marked by a solid black lineBack to article page