highly significantp < 0.0001
The difference in frequencies of variants within cline centre groups between the filtered (SCV only) and unfiltered datasets was highly significant (European taurine S1: Χ 2 = 13,151, df = 2; p < 0.0001; African taurine S1: Χ 2 = 17,118, df = 2; p < 0.0001), indicating an enrichment of variants with restricted gene flow and unbiased introgression.