Beginning of this June F&O series, nifty options open interest application on excel was displaying data in incorrect way. So I have gone through the issue and have updated the data selection for OI graph. For June month you will need to download copy of this tiny application for nifty options, as highest and lowest end strike witnessed some open interest build up. This tool is very useful in open interest, volume and price analysis.
Below is the free downloadable update for current month series: