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Show StDev: Show the standard deviation on the chart. StdDev Rate: Set the standard deviation rate. 1 = one standard deviation. .25 = .25 standard deviation or 25 percent of a standard deviation. StDev Period: Set the time frame for the standard deviation. Daily Weekly Monthly Quarterly Bi-Annually Annually StdDev Iterations: Set the number of standard deviation to show on the chart. Show Vol Histogram: Shows a histogram of over and under valued options. Vol Histogram Type: Set the time frame for the standard deviation. Theoretical Volatility vs Market Volatility Theoretical Volatility vs Settlement Volatility Market Volatility vs Settlement Volatility