A benchmark index of Indian equities markets, the 30-scrip Sensitive Index (Sensex), on Thursday was trading 23.89 points or 0.09 percent down during the morning session.The wider 50-scrip Nifty of the National Stock Exchange (NSE) was also trading 9.65 points or 0.12 percent down at 8,353.40 points.The Sensex of the S&P Bombay Stock Exchange (BSE), which opened at 27,681.49 points, was trading at 27,663.83 points (at 9.28 a.m.) in the early session, down 23.89 points or 0.09 percent from the previous day's close at 27,687.72 points.The Sensex touched a high of 27,798.13 points and a low of 27,662.25 points in the trade so far.