Benchmark equity indices Sensex and Nifty ended almost flat in a see-saw trade on Tuesday as investors traded cautiously, awaiting cues from the US Federal Reserve’s policy stance. The 30-share BSE Sensex slipped 29.07 points or 0.04 per cent to settle at 66,355.71. During the day, it touched an intra-day peak of 66,559.29 and hit the lowest level of 66,177.62. The NSE Nifty inched up by 8.25 points or 0.04 per cent to end at 19,680.60. The broader index moved between the range of 19,729.35 and 19,615.95.