Daily Volatility

Below is a collection of graphs showing daily volatility for 50 stocks and ETFs traded on U.S. exchanges.  Most of the graphs have data beginning in July of 2007; the last data date is February 15, 2008.  Only raw minute by minute intraday price changes were used for the calculation of gamma and the closing price graph has the last price of the the day.  Two stocks in the series had two for one share spl