A benchmark index of Indian equities markets, the 30-scrip Sensitive Index (Sensex), on Tuesday was trading at 61.31 points or 0.22 percent up during the morning session.The wider 50-scrip Nifty of the National Stock Exchange (NSE) was also trading at 14 points or 0.16 percent up at 8,617.45 points.The Sensex of the S&P Bombay Stock Exchange (BSE), which opened at 28,381.82 points, was trading at 28,481.43 points (at 9.21 a.m.) in the early session, up 61.31 points or 0.22 percent from the previous day's close at 28,420.12 points.The Sensex has touched a high of 28,506.89 points and a low of 28,354.81 points in the trade so far.