Reconstructing the population history of Sinhalese, the major ethnic group in Śrī Laṅkā:
Interestingly, we found an unexpected excess of smaller chunks sharing between Marāṭhā and Sinhala (>16%) than the Marāṭhā and STU, thus supporting the linguistic hypothesis of Geiger, Turner and van Driem. To confirm the excess sharing, we looked for the population which was sharing maximum IBD with Sinhala and STU.
Looks like confirmation of Sinhala western Indian origins rather than eastern Indian origins.
did they cross compare with sufficient Bengali and other East Indian samples?