On Tuesday, the benchmark indices were trading flat with Sensex up around 10 points or 0.01% at 66,380 and the Nifty-50 up around 4 points or 0.016% at 19,680. About 1,985 shares have advanced, 1,176 declined, and 159 are unchanged on the BSE. Top gainers and losers on BSE Sensex Index are as follows: The …