The Sensex has slipped into the negative zone and is now down two points at 13,188.Tata Steel has gained 3.6% at Rs 513. BHEL has surged 2.3% to Rs 2,520, and Cipla has added 1.5% to Rs 237. Bharti Airtel, Hindalco and ICICI Bank are up around 1% each at Rs 772, Rs 138 and Rs 866, respectively.Dr.Reddy's has shed 2.8% to Rs 700. HLL has dropped 2.5% to Rs 204.Ranbaxy, HDFC, ACC and Gujarat Ambuja have slipped around 1.5% each to Rs 353, Rs 1,585, Rs 736 and Rs 108, respectively.Out of 2,369 stocks traded so far, 1,557 have advanced, 739 have declined and 73 are unchanged.