The step size in price to determine the intervals for the lines.
The maximum number of lines above and below the current price.
The color, style, and thickness of the lines for better visualization.
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 publication is governed by House rules. You can favorite it to use it on a chart.