Indian simulations.

How would Indians look like without one of their three major ancestral components: Iranian Farmer, Steppe MLBA and AASI?

Let's see by artifically subtracting them one by one from the G25 coordinates Bhumihar Brahmin from North India.

1) Bhumihar minus AASI

0% AASI makes the Bhumihar closest to Pamiri Tajiks and some North East Caucasians who have high proportions of Iranian Farmer plus Steppe ancestry. Here's how the DNA looks like.

PCA position. 

Lies outside the South Asian cluster and instead clusters with Pamiri Tajiks, close to North East Caucasians.

2) Bhumihar without Iranian Farmer

This individual is not close to any modern Indian and lies outside the Indian cline completely. 

3) Bhumihar without Steppe MLBA

Wow, this individual literally still lies on the Indian cline even after artifically subtracting 26% Steppe ancestry from his genome. In fact, he now resembles a normal South Indian mid caste. This is further confirmed by the fact that the Bhumihar-NoSteppe simulation is the only one that still lies in the modern Indian cline on a South Asian PCA.

Distances to Ancients.

We get the same results. The no-Steppe simulation is the only one that has low enough genetic distances to some kind of Ancient Indian populations, namely the IVC and Swat samples. The no-AASI simulation is closest to Iron Age Tajikistan and Kazakasthan. The no-Iranian sim is not close to anything.