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Reliance, India's biggest company by market capitalization, was up 0.4 percent after Goldman Sachs upgraded the refiner to buy.
At 9:16 a.m. (0346 GMT), the main 30-share BSE index was up 0.28 percent at 17,755.82, with 23 of its components advancing.
The 50-share NSE index was up 0.18 percent at 5,371.60.