Fig. 3

Sharing of ancient and recent IBD blocks between populations in focus regions. IBD sharing is calculated as a sum of IBD segments averaged per pair of individuals. Sharing of IBD blocks is calculated separately for short, ancient blocks (1–3 cM) and more recent 4–10 cM blocks. Recent IBD blocks are typically shared inside the populations, while sharing of ancient IBD blocks is more complex. Darker colors correspond to higher amounts of shared IBD