Fig. 2
From: Alignment-free genome comparison enables accurate geographic sourcing of white oak DNA
The principal coordinate plots (PCoA) of 92 white oak tree samples based on the \( {d}_2^{\ast } \) dissimilarity values using a) 50 Mbp, b) 100 Mbp, and c) 300 Mbp of next generation sequencing data. The k-mer length is 12 and the Markov order of the background sequence is 10. With sequence quantity of 100 and 300 Mbp, the Europe (EU) and Asia (AS) samples are clearly separated in the PCoA plots. Four western North America samples separate from the other eastern North America samples