The Sensex is now down 51 points at 13,601.Satyam has tumbled nearly 3% to Rs 473. Tata Motors has slipped over 2% to Rs 908, and SBI has shed 1.7% to Rs 1,192.Larsen & Toubro, HDFC, Maruti, HDFC Bank and Reliance Communications are down over 1% each to Rs 1,443, Rs 1,575, Rs 887, Rs 1,017 and Rs 431, respectively.Gujarat Ambuja has surged 2.7% to Rs 140. ONGC has rallied nearly 2% to Rs 928. Bharti Airtel has spurted 1% to Rs 628.Out of 2,623 stocks traded so far, 1,485 have advanced, 1,074 have declined and the rest are unchanged.