The index, soon, rebounded and displayed positive bias for most part of the trading day. Aggressive buying in banking, oil and realty stocks led the index surge to a high of 13,684 - up 591 points from the day's low. The Sensex finally ended (provisional) with a gain of 513 points at 13,625.
The NSE Nifty moved up 132 points to settle at 4,079.