Andronovo pastoralists brought steppe ancestry to South Asia (Narasimhan et al. 2018 preprint)

Over at bioRxiv at this LINK. Note that the Andronovo samples that are shown to be the best fit for the steppe ancestry in South Asians are labeled Steppe_MLBA_East (ie. Middle to Late Bronze Age eastern steppe). Below is the abstract and a couple of key quotes from the paper and its supp info PDF. Emphasis is mine:

The genetic formation of Central and South Asian populations has been unclear