This is the typical Bollinger Bands indicator made of linear regression for earch lines : center, high and low deviation of the average price.
//standard parameters of Bollinger Bands :
//PERIOD = 20
//dev = 2
i1 = LinearRegression[PERIOD](Close)
up = i1+dev*STD[PERIOD](i1)
down = i1-dev*STD[PERIOD](i1)
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