Two lines are displayed at the top and bottom, the timing of inversion at the upper and lower limits,
It also serves as a guide for buying and selling on the intermediate line.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.