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Principal component analysis (PCA) revealing the genetic relationship between the 392 accessions used in this work. CHE: Accessions that were exclusively assessed in Switzerland; GBR: Accessions exclusively assessed in GBR and CHE; NOR: Accessions exclusively tested in NOR and CHE; SRB: Accessions exclusively tested in SRB and CHE; all: Accessions tested in CHE, GBR, NOR and SRB; SWE: Accessions tested exclusively in Sweden and CHE.
