The default settings are as he describes:
white line is the previous day close
red zone = +/- 20 from the previous day close
yellow zone = +/- 40 from the previous day close
green zone = +/- 60 from the previous day close
blue zone = +/- 100 from the previous day close
The source code is open, so feel free to take a look and see whats up. This indicator is quite similar to his, however there is a gap at the cash close to overnight open on his chart that I'm not sure how to adjust for. In any case, this one is still pretty good!
I hope it helps,
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.