Thanks.. I checked the websites out.. for eg, it says today's fair value is $9.20. Does it mean that I add $9.20 or subtract $9.20 to the previous day's fair value? If yesterday's published fair value for S&P on CNN.com is 1338.53 for example, do I add $9.20 to the 1338.53 and that will give me the latest fair value?