0-5% Steppe? You mean in the last 3 millennia Mazandaranis weren't influencend at all by Indo-Europeans, Eastern Iranians, Turks etc.? This seems unlikely at best.
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No, they heavily resisted Arab influence.
Anyway, the point im trying to make is they barely score any steppe compared to all other Iranic groups despite history.
https://en.wikipedia.org/wiki/Mazandaran_Province
agree. But they still have 25% R1a. I think steppe ancestry is bigger than 5%.
They can be modelled as Chalcolithic Iranian (around 75%) plus Early Iranic pastoralist (22%) and around 1 %Mongolian.
That means they're about 13% Steppe.
Edit: if you use Turkmenistan_IA as proxy for early Iranics.
Thats why i said they are Archaic iranians.
Huge margin? Lol 15-25% is nothing for west iranics.
http://oi67.tinypic.com/2a6723q.jpg