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It's not that CHG descended directly from Iran_N, it's that it descends from a population that was similar to Iran_N and then mixed with EHG, but because it's a ghost population we say it was Iran_N + EHG, because that's the closest mix.
Ther's no way to model Iran_N without basal eurasian, it whould be like modeling Arabs without Natufian 🤦♂️, but here's the modeling, from the same study.
Levant_N is 70% Natufian and 30% Barcin. CHG is 70% Iran_N and 30% EHG, and you comparing distances with G25 is not going to change that, G25 is not the best model to work with very ancient groups like that, together.
Everything out of Africa is a neanderthal admixed basal eurasian or basal eurasian, this way of looking at things doesn't make any sense, WHG is a paleolithic european component, just like natufians are to the levant.