There are multiple links to get the OptionsChain data.
The link that I am using is
http://www.nseindia.com/live_market...in/optionKeys.jsp?symbol=NIFTY&date=31OCT2013
The image that you have posted access the following link
http://www.nseindia.com/live_market...-&segmentLink=17&symbolCount=2&segmentLink=17
I had this doubt earlier and people told me that whatever is used in the Tool is fine and whatever you see in the OAT tools is the latest.
On Yesterday the NIFTY SPOT closed at 6089.05.
You will see that the link that you have posted has NIFTY Closing price as 6079.05.
Anyway let the Experts tell me which one to take. My view is that during market hours you will get the same data for both the links. After market closing however the data changes a bit due to square off which is not updated in one of the links.
I am also sure about this because I posted the VOLT chart after 3:30 and the VOLT chart that I am seeing now is different. So between 3:30 to 3:45 the data is still getting updated in OptionsChain due to some squaring Off