Finally, we investigated the fine-scale genetic structure in southern Scandinavia after the
introduction of Steppe-related ancestry using a temporal transect of 38 Late Neolithic and Early
Bronze Age Danish and southern Swedish individuals. Although the overall population genomic
signatures suggest genetic stability, patterns of pairwise IBD-sharing and Y-chromosome
haplogroup distributions indicate at least three distinct ancestry phases during a ~1,000-year time
span: i) An early stage between ~4,600 BP and 4,300 BP, where Scandinavians cluster with early
CWC individuals from Eastern Europe, rich in Steppe-related ancestry and males with an R1a Y-
chromosomal haplotype (Extended Data Fig. 8A, ; ii)