On Tuesday, the benchmark indices were trading flattish with the Sensex down around 277 points or 0.23% at 72,466, while the Nifty-50 was down around 96 points or 0.43% at 21,960. About 1,696 shares have advanced; 1,231 declined; and 122 are unchanged on the BSE. Top gainers and losers on the BSE Sensex index: The …