The Indian equity benchmarks were trading on a flat note on Tuesday amid weak cues from global markets. The Sensex traded in a band of 240 points and Nifty 50 index touched an intraday high of 18,053.90 and low of 17,982.60. The Nifty is close to its importance psychological level of 18,000 and it is likely face some resistance around these levels, analysts said.