Linear regression line with an addition of standard error channel projection.
Linear regression attempts to model the relationship between two variables by fitting a linear equation to observed data. One variable is considered to be an explanatory variable, and the other is considered to be a dependent variable. For example, a modeler might want to relate the weights of individuals to their heights using a linear regression model.

Two things to pay attention to:
WSO & WRO Channel
This version of WSO (Widner Support Oscillator) and WRO (Widner Resistance Oscillator) shows channel on chart instead of displaying oscillator values in a separate window.
WSP & WRO
WSO (Widner Support Oscillator) and WRO (Widner Resistance Oscillator).
Volatilty Bands
This is the version that David Rooke proposes as a solution to Bollinger Bands issues.
Volatility Bands Percent
This is the version that David Rooke proposes as a solution to Bollinger Bands issues in a percent representation.