Native American ancestry proportions and age of admixture in the Quebec population sample by different methods and using different reference populations (see Table S2).

aFor ADMIXTURE, Siberians were used as a third reference population,. whereas IBD sharing and ALDER, used only Native Americans as a single reference population. bFor HAPMIX, 50 samples were randomly selected from each of the reference populations to match the Native North American sample size.a. 针对ADMIXTURE分析，将西伯利亚人群用作第三组参考群体；而针对IBD共享分析与ALDER方法，仅以美洲原住民作为单一参考群体。b. 针对HAPMIX分析，从各参考群体中随机选取50个样本，以匹配北美原住民样本的样本量。