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To make a long story short it seems that R1a1a is an old haplogroup with a lot of structure across Eurasia.
Maju points me to a paper in Haplogroup R1a1-M198 is a major clade of Y chromosomal haplogroups which is distributed all across Eurasia.
To this date, many efforts have been made to identify large SNP-based subgroups and migration patterns of this haplogroup.
The origin and spread of R1a1 chromosomes in Eurasia has, however, remained unknown due to the lack of downstream SNPs within the R1a1 haplogroup.
The two additional binary markers present an effective tool because now more than 98% of the samples analyzed assign to one of the three sub-haplogroups.