1) The script takes current INDIA VIX as input Daily time frame for NIFTY 2) Used a Formula VIX Value / Square root of Time Period 3) Change Timeframe input accordingly 1 Year = 1, Monthly = 12, Weekly = 52, Daily = 365 4) based point 2 formula with 1 standard deviation it creates upper & lower range bands 5) This is generally used for option selling by big traders they go and sell above the band strikes