Mumbai, April 19 : The BSE Sensex on Tuesday slumped 703.59 points to settle at 56,463.15 on heavy selling in IT, Power, Realty and Technology stocks. The Nifty of National Stock Exchange (NSE) too fell 215 points at 16,958.65. The Sensex registered days high and low at 57,464.08 and 56,009.07 points respectively. The Nifty recorded days high and low at 17,275.65 and 16,824.70 respectively. NV PRT