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if I understand well the Damgaard counterdicts the recent Laziridis paper on the subject of the ASI cline formed in IVC
Laziridis describes ASI cline as AASI + Iranian Farmer + West Siberian HG,
while Damgaard says IVC period in India is AASI + Namazga CA, and Namazga CA as Iranian farmer + EHG (and absence of CHG)
I noticed this too, one paper mentions Namazga as an early source of "west Eurasian" ancestry, but it seems like the other paper makes it clear they actually introduced EHG ancestry with them. Despite this I think Namazga CA is just a proxy for an Iran Neo rich population since Damgaard didn't have other samples from the Turan or Indus to explain this ancestry in South Asians. Iran_Neo probably entered South Asia as early as Mehrgarh so Namazga CA is way too young to have been the primary source of this ancestry.
If the rest of the BMAC didn't contribute to the genetic legacy of South Asia I highly doubt Namazga CA did, but then again it's possible the canals at Shortugai were inspired by Namazga technology and Namazga is known to have traded with the IVC and introduced certain millets to them. That being said I really don't think Namazga CA had any large contribution to modern South Asians, they might be picking up on ancestry basal to Namazga from the Jeitun culture or earlier, the same cultures that were interacting with Mehrgarh and probably had Iran Neo ancestry without any EHG.