A benchmark index of Indian equities markets, the 30-scrip BSE Sensitive Index (Sensex), was trading flat at 11.49 points or 0.04 percent up as healthcare stocks rose.The wider 50-scrip Nifty of the National Stock Exchange (NSE) also trading flat at 5 points or 0.06 percent down at 8,537.95 points.The Sensex of the S&P Bombay Stock Exchange (BSE), which opened at 28,216.09 points, was trading at 28,173.21 points (1 p.m.), up 11.49 points or 0.04 percent from the previous day's close at 28,161.72 points.The Sensex touched a high of 28,249.60 points and a low of 28,130.31 points in the intra-day trade so far.Good buying was observed in healthcare sector, while heavy selling pressure was seen in capital goods, metal and oil and gas sectors.The S&P BSE healthcare index gained 74.19 points; while capital goods index plunged by 234.12 points, metal index dropped by 99.97 points and oil and gas index fell by 42.82 points.